LSI LSI53C1000, Technical Manual

Page: 201 / 384

SCSI Registers 4-91
Register: 0x57
Chip Control One (CCNTL1)
Read/Write
PULLDIS Pull Disable 7
Setting this bit causes all internal pulls to be disabled on
all pins. This bit is intended for manufacturing test only
and should NOT be set for normal operation. PULLDIS
has precedence over PULLEN if both bits are set.
PULLEN Pull Enable 6
Setting this bit causes all internal pulls to be enabled on
all pins. This bit is intended for manufacturing test only
and should NOT be set for normal operation.
DIS64MAS Disable 64-bit Master Operation 5
Setting this bit causes the LSI53C1000 to no longer
request 64-bit master data transfers. If this bit is set,
64-bit data transfers will be disabled for all master
transactions.
DIS64SLV Disable 64-bit Slave Cycles 4
Setting this bit disables 64-bit slave data transfers to the
SCRIPT RAM. This causes only 32-bit data transfers to
occur.
DDAC Disable Dual Address Cycle 3
When this bit is set, all 64-bit addressing as a master is
disabled. No dual address cycles will be generated by the
LSI53C1000.
When this bit is cleared, the LSI53C1000 generates dual
address cycles based on the master operation performed
and the value of its associated selector register.
64TIMOD 64-bit Table Indirect Indexing Mode 2
When this bit is cleared, bits [28:24] of the first table entry
Dword will select one of 22 possible selectors to be used
in a BMOV operation. When this bit is set, bits [31:24] of
the first table entry Dword will be copied directly into
7 6 5 4 3 2 1 0
PULLDIS PULLEN DIS64MAS DIS64SLV DDAC 64TIMOD EN64TIBMV EN64DBMV
0 0 0 0 x x 0 0