82C881 Datasheet, PDF (24/46 Pages) List of Unclassifed Manufacturers – FireLink 1394 OHCI Link Controller

FireLink 1394 OHCI
82C881
5.2.1 Tx FIFO-Related Registers
7
6
5
4
3
2
1
0
OFST 00h
IsochronousTx Configuration Register
Holds configuration data for Isochronous Transmit sub-FIFO
Byte 0
Default = 40h
Write Watermark bits [7:0] - If the number of empty quadlet space is equal to or greater
than this value, the corresponding DMA controller can start a burst write into the FIFO.
OFST 01h
Byte 1
Default = 80h
Read Watermark bits [5:0] - If the number of quadlets in the sub FIFO is
greater than or equal to this value, the Link can start reading from that FIFO.
Write Watermark bits [9:8]
OFST 02h
Byte 2
Default = 00h
Sub-FIFO Size bits [3:0]
Read Watermark bits [9:6]
OFST 03h
Byte 3
Default = 10h
Reserved
Sub-FIFO Size bits [9:4]
OFST 04h
Asynchronous Tx Response Configuration Register
Holds configuration data for AT Response sub-FIFO
Byte 0
Default = 40h
Write Watermark bits [7:0]
OFST 05h
Byte 1
Default = 00h
Read Watermark bits [5:0]
Write Watermark bits [9:8]
OFST 06h
Byte 2
Default = 02h
Sub-FIFO Size bits [3:0]
Read Watermark bits [9:6]
OFST 07h
Byte 3
Default = 10h
Reserved
Sub-FIFO Size bits [9:4]
OFST 08h
Asynchronous Tx Request Configuration Register
Holds configuration data for AT Request sub FIFO
Byte 0
Default = 40h
Write Watermark bits [7:0]
OFST 09h
Byte 1
Default = 00h
Read Watermark bits [5:0]
Write Watermark bits [9:8]
OFST 0Ah
Byte 2
Default = 02h
Sub-FIFO Size bits [3:0]
Read Watermark bits [9:6]
OFST 0Bh
Byte 3
Default = 10h
Reserved
Sub-FIFO Size bits [9:4]
OFST 0Ch
Physical Tx Configuration Register
Holds configuration data for Physical Transmit sub FIFO
Byte 0
Default = 40h
Write Watermark bits [7:0]
OFST 0Dh
Byte 1
Default = 00h
Read Watermark bits [5:0]
Write Watermark bits [9:8]
OFST 0Eh
Byte 2
Default = 02h
Sub-FIFO Size bits [3:0]
Read Watermark bits [9:6]
OFST 0Fh
Byte 3
Default = 10h
Reserved
Sub-FIFO Size bits [9:4]
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912-2000-031
Revision: 1.0