Scsi timer zero (stime0), Scsi timer, Zero (stime0) – Avago Technologies LSI53C876E User Manual
Page 177: Register: 0x48
SCSI Registers
4-83
R
Reserved
5
GPIO[4:2]
GPIO Enable
[4:2]
General purpose control, corresponding to bit 4 in the
register and the GPIO4 pin.
GPIO4 powers-up as a general purpose output, and
GPIO[3:2] power-up as general purpose inputs.
GPIO[1:0]
GPIO Enable
[1:0]
These bits power-up set, causing the GPIO1 and GPIO0
pins to become inputs. Clearing these bits causes
GPIO[1:0] to become outputs.
Register: 0x48
SCSI Timer Zero (STIME0)
Read/Write
HTH
Handshake-to-Handshake Timer Period
[7:4]
These bits select the handshake-to-handshake time-out
period, the maximum time between SCSI handshakes
(SREQ/ to SREQ/ in target mode, or SACK/ to SACK/ in
initiator mode). When this timing is exceeded, an interrupt
is generated and the HTH bit in the
register is set. The following table contains
time-out periods for the Handshake-to-Handshake Timer,
the Selection/Reselection Timer (bits [3:0]), and the
General Purpose Timer (
,
bits [3:0]). For a more detailed explanation of interrupts,
refer to
Chapter 2, “Functional Description.”
7
4
3
0
HTH[3:0]
SEL[3:0]
0
0
0
0
0
0
0
0