# Summary 
RTL8214FC/RTL8218B (maybe generic RTL821x) Register Layout

This is a sum up of what we got from the comments in the GPL sources. Additionally some SerDes registers where identified that work similar like the RTL838x/RTL839x built in SerDes.

# Basic registers

These basic registers are organized in pages of 32. Each page knows registers 0x00-0x1F

Page | Register | Bits | Feature | Documentation
--- | --- | --- | --- | ---
**Page** | **Register** | **Bits** | **INER** |  **Interrupt enable register**
0xa42 | 0x12 | 04:04 | LINK_CHANGE_INT
**Page** | **Register** | **Bits** | **unknown** | 
0xa42 | 0x14 | 07:07 | 500M_EEE_ABILITY
**Page** | **Register** | **Bits** | **PHYCR2** | 
0xa43 | 0x19 | 15:14 | RESERVED
0xa43 | 0x19 | 13:12 | CLOCKOUT_SOURCE | 
0xa43 | 0x19 | 11:11 | CLOCKOUT_FREQUENCY
0xa43 | 0x19 | 10:08 | RESERVED
0xa43 | 0x19 | 07:07 | CLOCKOUT_SSC_EN
0xa43 | 0x19 | 06:06 | CENTERTAP_SHORT_EN
0xa43 | 0x19 | 05:05 | PHY_MODE_EEE_EN | set to 1 to enable EEE
0xa43 | 0x19 | 04:04 | RESERVED
0xa43 | 0x19 | 03:03 | SYSCLK_SSC_EN
0xa43 | 0x19 | 02:02 | RESERVED
0xa43 | 0x19 | 01:01 | RXC_EN
0xa43 | 0x19 | 00:00 | CLOCKOUT_EN
**Page** | **Register** | **Bits** | **SDS Indirect** | **SerDes Indirect Access**
0xa43 | 0x1B | 15:00 | PATCH_ADDRESS | patch step 3, 5, 7, .. write address
0xa43 | 0x1C | 15:00 | PATCH_VALUE | patch step 4, 6, 8, ... read/write value
**Page** | **Register** | **Bits** | **PHYCR3** | **PHY specific control register 3**
0xa44 | 0x11 | 09:09 | RETRY_DOWN_SPEED_500
0xa44 | 0x11 | 05:05 | THR_RETRY_SPDN | 0 = 7 times, 1 = 3 times
0xa44 | 0x11 | 03:03 | EN_RETRY_SPEED_DOW
0xa44 | 0x11 | 02:02 | 2PAIR_AUTO_DOWNSPEED
**Page** | **Register** | **Bits** | **unknown** | 
0xb80 | 0x10 | 04:04 | PATCH_READY | patch step 2: wait until SerDEs acces ready (=1), go over to 0xa43:0x1b
**Page** | **Register** | **Bits** | **unknown** | 
0xb82 | 0x10 | 04:04 | ENABLE_PATCH | patch step 1: set to 1 to gain SerDEs access, go over to 0xb80:0x10

# Special registers

These additional/internal registers are organized in pages of 8. Each page knows registers 0x10-0x17. Their "absoulte" address can be calucalted by the formula page * 8 + (register - 16). It seems as if they are for the whole chip package and only accessed via the first port.

Page | Register | Bits | Feature | Documentation
--- | --- | --- | --- | ---
**Page** | **Register** | **Bits** | **Unknown Fiber** | **Absolute 0x1303**
0x260 | 0x13 | 12:08 | PHY_ADDRESS | Start PHY address. Do not modified it!
**Page** | **Register** | **Bits** | **Unknown** | **Absolute 0x1308**
0x261 | 0x10 | 14:13 | UNKOWN_RESET | write 0x3 and afterwards 0x0
**Page** | **Register** | **Bits** | **Unknown** | **Absolute 0x130b**
0x261 | 0x13 | 13:10 | DIS_FIBER_TX | each bit for on of ports 3-0 to disable (1) or enable (0) fiber tx
**Page** | **Register** | **Bits** | **PTP feature** | **Absolute 0x1600**
0x2C0 | 0x10 | 15:00 | PTP_TIME_NSEC_L
0x2C0 | 0x11 | 15:00 | PTP_TIME_NSEC_H
0x2C0 | 0x12 | 15:00 | PTP_TIME_SEC_L
0x2C0 | 0x13 | 15:00 | PTP_TIME_SEC_H
0x2C0 | 0x14 | 15:00 | PTP_TIME_CFG_0
0x2C0 | 0x15 | 15:00 | PTP_OTAG_TPID
0x2C0 | 0x16 | 15:00 | PTP_ITAG_TPID
0x2C0 | 0x17 | 15:00 | PTP_MAC_ADDR_L
0x2C1 | 0x10 | 15:00 | PTP_MAC_ADDR_M
0x2C1 | 0x11 | 15:00 | PTP_MAC_ADDR_H
0x2C1 | 0x12 | 15:00 | PTP_TIME_NSEC_L_RO
0x2C1 | 0x13 | 15:00 | PTP_TIME_NSEC_H_RO
0x2C1 | 0x14 | 15:00 | PTP_TIME_SEC_L_RO
0x2C1 | 0x15 | 15:00 | PTP_TIME_SEC_H_RO
0x2C1 | 0x16 | 15:00 | PTP_TIME_CFG_1
0x2C1 | 0x17 | 15:00 | PTP_TIME_INT_STS_P
**Page** | **Register** | **Bits** | **MAC SerDes 0 - register 0** | **Absolute 0x2020**
0x404 | 0x10 | 15:15 | DIS_RENWAY | 
0x404 | 0x10 | 14:14 | BYP_8B10B | 
0x404 | 0x10 | 13:12 | CDET | 
0x404 | 0x10 | 11:11 | DIS_TMR_CMA | 
0x404 | 0x10 | 10:10 | DIS_APX | 
0x404 | 0x10 | 09:09 | INV_HSI | 
0x404 | 0x10 | 08:08 | INV_HSO | 
0x404 | 0x10 | 07:06 | SDS_SDET_DEG | 
0x404 | 0x10 | 05:05 | CODEC_LPK | 
0x404 | 0x10 | 04:04 | AFE_LPK | 
0x404 | 0x10 | 03:03 | REMOTE_LPK | 
0x404 | 0x10 | 02:02 | SDS_TX_DOWN | 
0x404 | 0x10 | 01:01 | SDS_EN_RX | 
0x404 | 0x10 | 00:00 | SDS_EN_TX | 
**Page** | **Register** | **Bits** | **MAC SerDes 0 - register 3** | **Absolute 0x2023**
0x404 | 0x13 | 15:15 | WR_SOFT_RSTB	
0x404 | 0x13 | 14:14 | USE_25M_CLK
0x404 | 0x13 | 13:13 | MARK_CARR_EXT
0x404 | 0x13 | 12:12 | SEL_DEG	
0x404 | 0x13 | 11:08 | REG_CALIB_OK_CNT
0x404 | 0x13 | 07:07 | EXT_PWR_CTL	
0x404 | 0x13 | 06:06 | SOFT_RST | Set to 1 then to 0 to run digital soft reset
0x404 | 0x13 | 05:05 | CLR_SOFT_RSTB
0x404 | 0x13 | 04:00 | CMA_RQ
**Page** | **Register** | **Bits** | **MAC SerDes 0 - register 4** | **Absolute 0x2024**
0x404 | 0x14 | 15:13 | CFG_FRC_SDS_MODE | 0x6 = QSGMII
0x404 | 0x14 | 12:12 | CFG_FRC_SDS_MODE_EN | Enable SerDes forced mode
0x404 | 0x14 | 11:08 | CFG_UPD_RXD | 
0x404 | 0x14 | 07:04 | CFG_UPD_TXD | 
0x404 | 0x14 | 03:03 | CFG_UPD_RXD_DYN | 
0x404 | 0x14 | 02:02 | CFG_EN_LINK_FIB1G | 
0x404 | 0x14 | 01:01 | CFG_EN_LINK_SGM | 
0x404 | 0x14 | 00:00 | CFG_SGM_CK_SEL | 
**Page** | **Register** | **Bits** | **MAC SerDes 0 - register 7** | **Absolute 0x2027**
0x404 | 0x17 | 15:15 | CFG_8B10B_NO_CREXT | 
0x404 | 0x17 | 14:14 | CFG_NEG_CLKWR_A2D | 
0x404 | 0x17 | 13:13 | CFG_MIIXF_TS1K | 
0x404 | 0x17 | 12:12 | CFG_DLY_PRE8 | 
0x404 | 0x17 | 11:11 | CFG_GRXD_SEL | 
0x404 | 0x17 | 10:10 | CFG_LPI_CMD_MII | 
0x404 | 0x17 | 09:09 | CFG_MARK_RXSCR_ERR | 
0x404 | 0x17 | 08:08 | CFG_MARK_TXSCR_ERR | 
0x404 | 0x17 | 07:04 | BYP_START | 
0x404 | 0x17 | 03:00 | BYP_END | 
**Page** | **Register** | **Bits** | **MAC SerDes 0 - register 12** | **Absolute 0x202c**
0x405 | 0x14 | 15:08 | CFG_INB_TIMEOUT |
0x405 | 0x14 | 07:04 | ABILITY |
0x405 | 0x14 | 03:03 | RDM_ALGOR |	Redundancy algorithm 0 = 16/20b, 1 = 32/40b
0x405 | 0x14 | 02:02 | SD_DET_ALGOR |	
0x405 | 0x14 | 01:01 | AUTO_DET_ALGOR |	
0x405 | 0x14 | 00:00 | SEND_NP_ON	 |
**Page** | **Register** | **Bits** | **MAC SerDes 0 - register unknown** | **Absolute 0x2060**
0x40c | 0x11 | 15:15 | RING_PLL_EN | ring PLL 0 = disable, 1 = enable
**Page** | **Register** | **Bits** | **MAC SerDes 1 - register 0** | **Absolute 0x2120**
0x424 | 0x10 | 15:15 | DIS_RENWAY | 
0x424 | 0x10 | 14:14 | BYP_8B10B | 
0x424 | 0x10 | 13:12 | CDET | 
0x424 | 0x10 | 11:11 | DIS_TMR_CMA | 
0x424 | 0x10 | 10:10 | DIS_APX | 
0x424 | 0x10 | 09:09 | INV_HSI | 
0x424 | 0x10 | 08:08 | INV_HSO | 
0x424 | 0x10 | 07:06 | SDS_SDET_DEG | 
0x424 | 0x10 | 05:05 | CODEC_LPK | 
0x424 | 0x10 | 04:04 | AFE_LPK | 
0x424 | 0x10 | 03:03 | REMOTE_LPK | 
0x424 | 0x10 | 02:02 | SDS_TX_DOWN | 
0x424 | 0x10 | 01:01 | SDS_EN_RX | 
0x424 | 0x10 | 00:00 | SDS_EN_TX | 
**Page** | **Register** | **Bits** | **MAC SerDes 1 - register 3** | **Absolute 0x2123**
0x424 | 0x13 | 15:15 | WR_SOFT_RSTB	
0x424 | 0x13 | 14:14 | USE_25M_CLK
0x424 | 0x13 | 13:13 | MARK_CARR_EXT
0x424 | 0x13 | 12:12 | SEL_DEG	
0x424 | 0x13 | 11:08 | REG_CALIB_OK_CNT
0x424 | 0x13 | 07:07 | EXT_PWR_CTL	
0x424 | 0x13 | 06:06 | SOFT_RST
0x424 | 0x13 | 05:05 | CLR_SOFT_RSTB
0x424 | 0x13 | 04:00 | CMA_RQ
**Page** | **Register** | **Bits** | **MAC SerDes 1 - register 4** | **Absolute 0x2124**
0x424 | 0x14 | 15:13 | CFG_FRC_SDS_MODE | 
0x424 | 0x14 | 12:12 | CFG_FRC_SDS_MODE_EN | 
0x424 | 0x14 | 11:08 | CFG_UPD_RXD | 
0x424 | 0x14 | 07:04 | CFG_UPD_TXD | 
0x424 | 0x14 | 03:03 | CFG_UPD_RXD_DYN  | 
0x424 | 0x14 | 02:02 | CFG_EN_LINK_FIB1G  | 
0x424 | 0x14 | 01:01 | CFG_EN_LINK_SGM | 
0x424 | 0x14 | 00:00 | CFG_SGM_CK_SEL | 
**Page** | **Register** | **Bits** | **MAC SerDes 1 - register 7** | **Absolute 0x2127**
0x424 | 0x17 | 15:15 | CFG_8B10B_NO_CREXT | 
0x424 | 0x17 | 14:14 | CFG_NEG_CLKWR_A2D | 
0x424 | 0x17 | 13:13 | CFG_MIIXF_TS1K | 
0x424 | 0x17 | 12:12 | CFG_DLY_PRE8 | 
0x424 | 0x17 | 11:11 | CFG_GRXD_SEL | 
0x424 | 0x17 | 10:10 | CFG_LPI_CMD_MII | 
0x424 | 0x17 | 09:09 | CFG_MARK_RXSCR_ERR | 
0x424 | 0x17 | 08:08 | CFG_MARK_TXSCR_ERR | 
0x424 | 0x17 | 07:04 | BYP_START | 
0x424 | 0x17 | 03:00 | BYP_END | 
**Page** | **Register** | **Bits** | **MAC SerDes 1 - register 12** | **Absolute 0x212c**
0x425 | 0x14 | 15:08 | CFG_INB_TIMEOUT |
0x425 | 0x14 | 07:04 | ABILITY |
0x425 | 0x14 | 03:03 | RDM_ALGOR |	Redundancy algorithm 0 = 16/20b, 1 = 32/40b
0x425 | 0x14 | 02:02 | SD_DET_ALGOR |	
0x425 | 0x14 | 01:01 | AUTO_DET_ALGOR |	
0x425 | 0x14 | 00:00 | SEND_NP_ON	 |
**Page** | **Register** | **Bits** | **MAC SerDes 1 - register unknown** | **Absolute 0x2161**
0x42c | 0x11 | 15:15 | RING_PLL_EN | ring PLL 0 = disable, 1 = enable
**Page** | **Register** | **Bits** | **MAC SerDes 1 - page unknown** | **Absolute 0x2162**
0x42c | 0x12 | 15:00 | 
**Page** | **Register** | **Bits** | **MAC SerDes 1 - page unknown** | **Absolute 0x2169**
0x42d | 0x11 | 00:00 | ANA_RESET
**Page** | **Register** | **Bits** | **MAC SerDes 1 - page unknown** | **Absolute 0x2171**
0x42e | 0x11 | 15:00 |
**Page** | **Register** | **Bits** | **Unknown SerDes - page unknown** | **Absolute 0x2261**
0x44c | 0x11 | 15:00 | | This is some unknown PLL register - write 0x4000 to disable ring PLL
**Page** | **Register** | **Bits** | **Unknown SerDes - page unknown** | **Absolute 0x2269**
0x44d | 0x11 | 15:00 | | 
**Page** | **Register** | **Bits** | **Unknown SerDes - page unknown** | **Absolute 0x2271**
0x44e | 0x11 | 15:00 | | Some unknown register for fiber jitter on RTL8214FC
**Page** | **Register** | **Bits** | **Unknown filter register** | **Absolute 0x2310**
0x462 | 0x10 | 13:12 | OFFSET_CALIBRATION
**Page** | **Register** | **Bits** | **Unknown analog** | **Absolute 0x2315**
0x462 | 0x15 | 15:15 | ISTANK_SEL_HS_TG_1
0x462 | 0x15 | 14:14 | ISTANK_SEL_HS_TG_0
0x462 | 0x15 | 13:12 | CMU_SEL_CP_TG
0x462 | 0x15 | 11:10 | CMU_SELPREDIV_TG
0x462 | 0x15 | 09:08 | CMU_LOOP_DIV4_TG
0x462 | 0x15 | 07:04 | CMU_ICP_SEL_TG
0x462 | 0x15 | 03:03 | CMU_SEL_R_TG_3
0x462 | 0x15 | 02:00 | CMU_SEL_R_TG_2_0
**Page** | **Register** | **Bits** | **Analog register** | **Absolute 0x2322**
0x464 | 0x12 | 15:11 | FILTER_OUT0
0x464 | 0x12 | 10:07 | EQ_SELREG
0x464 | 0x12 | 07:00 | EQ_IN
**Page** | **Register** | **Bits** | **Analog register** | **Absolute 0x2323**
0x464 | 0x13 | 15:15 | RX_EQ_BOOST_DC
0x464 | 0x13 | 14:10 | FILTER_OUT3
0x464 | 0x13 | 09:05 | FILTER_OUT2
0x464 | 0x13 | 04:00 | FILTER_OUT1
**Page** | **Register** | **Bits** | **Analog register** | **Absolute 0x2325**
0x464 | 0x15 | 15:15 | S0_REG_CLKLA_EN
0x464 | 0x15 | 14:13 | S0_REG_RSEL
0x464 | 0x15 | 12:10 | S0_REG_KI
0x464 | 0x15 | 09:09 | S0_REG_KD
0x464 | 0x15 | 08:06 | S0_REG_KP2
0x464 | 0x15 | 05:04 | S0_REG_KP1
0x464 | 0x15 | 03:00 | S0_REG_KP1_1
**Page** | **Register** | **Bits** | **Unknown** | **Absolute 0x2327**
0x464 | 0x17 | 15:15 | UNKNOWN_RESET | write 1 and 0 to do some reset
**Page** | **Register** | **Bits** | **Unknown CMU register** | **Absolute 0x233c**
0x467 | 0x14 | 15:0 | | For CMU reset write 0x143d, 0x3c15, 0x3c17, 0x0000