XR22804 Datasheet, PDF (21/47 Pages) Exar Corporation – Hi-Speed USB to 10/100 Ethernet Bridge with 4 UARTs

XR22804
Address
Register Name
0x060
0x061
0x062
0x063
0x064
0x065
TX_FIFO_RESET
TX_FIFO_FILL (MSB)
TX_FIFO_FILL (LSB)
TX_WIDE_MODE
RX_FIFO_RESET
RX_FIFO_FILL (MSB)
RX_FIFO_FILL (LSB)
RX_WIDE_MODE
Table 5: XR22804 Register Map
Bit 7
(15)
0
0
0
0
0
0
Bit 6
(14)
0
0
0
0
0
0
Bit 5
(13)
0
0
0
0
0
0
Bit 4
(12)
Bit 3
(11)
0
0
0
FILL[7:0]
0
0
0
0
0
0
FILL[7:0]
0
0
0x066
RX_CONTROL
0
0
0
0
0
FLOW_THRESHOLD (MSB)
0
0
0
0
0
0x067
FLOW_THRESHOLD (LSB)
THRESH [7:0]
Miscellaneous Registers
0x081
CUSTOM_DRIVER
0
0
0
0
0
Bit 2
(10)
Bit 1
(9)
0
0
FILL[10:8]
Bit 0
(8)
RST
0
0
EN
0
0
RST
FILL[10:8]
0
0
EN
MAX_ LOW_
0
PKT_- LATEN
SIZE
CY
THRESH [10:8]
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
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exar.com/XR22804
Rev 1B