XR22801 Datasheet, PDF (19/42 Pages) Exar Corporation – Hi-Speed USB to 10/100 Ethernet Bridge

XR22801
Table 5: XR22801 Register Map
Address
Register Name
Bit 7
(15)
Bit 6
(14)
Bit 5
(13)
Bit 4
(12)
Bit 3
(11)
Bit 2
(10)
Bit 1
(9)
Bit 0
(8)
0x061
TX_FIFO_FILL (MSB)
TX_FIFO_FILL (LSB)
0
0
0
0
FILL[7:0]
FILL[10:8]
0x062
TX_WIDE_MODE
0
0
0
0
0
0
0
EN
0x063
RX_FIFO_RESET
0
0
0
0
0
0
0
RST
0x064
0x065
RX_FIFO_FILL (MSB)
RX_FIFO_FILL (LSB)
RX_WIDE_MODE
0
0
0
0
0
FILL[10:8]
FILL[7:0]
0
0
0
0
0
0
0
EN
0x066
RX_CONTROL
MAX_ LOW_
0
0
0
0
0
0
PKT_- LATEN
SIZE
CY
FLOW_THRESHOLD (MSB)
0
0
0
0
0
0x067
FLOW_THRESHOLD (LSB)
THRESH [7:0]
THRESH [10:8]
Miscellaneous Registers
0x081
CUSTOM_DRIVER
0
0
0
0
0
0
0
ACTIVE
UART Register Descriptions
Note that all register reset default values are ’0’ unless otherwise specified. All registers are 16 bits.
UART_ENABLE (0x040) - Read/Write
Bit
15:2
1
0
Default
Description
0x0000 Reserved
These bits are reserved and should be written as ‘0’.
0
RX
0: Disable UART RX
1: Enable UART RX
0
TX
0: Disable UART TX
1: Enable UART TX
FORMAT (0x045) - Read/Write
Note that the CDC_SET_LINE_CODING command may be used to set the UART data format in addition to this registers.
Bit
15:8
Default
Description
0x00
Reserved
These bits are reserved and should be written as ‘0’.
© 2015 Exar Corporation
19 / 42
exar.com/XR22801
Rev 1B