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SCSI Registers 4-31
Register: 0x05
SCSI Transfer (SXFER)
Read/Write
Note:
When using Table Indirect I/O commands, bits [7:0] of this
register are loaded from the I/O data structure.
TP[2:0] SCSI Synchronous Transfer Period [7:5]
These bits determine the SCSI synchronous transfer
period used by the LSI53C875A when sending
synchronous SCSI data in either the initiator or target
mode. These bits control the programmable dividers in
the chip.
The synchronous transfer period the LSI53C875A should
usewhentransferringSCSIdataisdeterminedinthe
following example:
The LSI53C875A is connected to a hard disk which can
transfer data at 10 Mbytes/s synchronously. The
LSI53C875A’s SCLK is running at 40 MHz. The
synchronous transfer period (SCSI Transfer (SXFER))is
found as follows:
SXFERP = Period/SSCP + ExtCC
Period = 1
÷ Frequency = 1 ÷ 10 Mbytes/s = 100 ns
SSCP = 1
÷=SSCF = 1 ÷ 40 MHz = 25 ns
754 0
TP[2:0] MO[4:0]
00000000
TP2 TP1 TP0 XFERP
000 4
001 5
010 6
011 7
100 8
101 9
110 10
111 11