Avago Technologies LSI8751D - Manual (Page 178)

5-62 SCSI Operating Registers
Wide Residue message is received. It may also be an
overrun data byte. The power-up value of this register is
indeterminate.
Register: 0x46 (0xC6)
Memory Access Control (MACNTL)
Read/Write
TYP[3:0] Chip Type [7:4]
These bits identify the chip type for software purposes.
This technical manual applies to devices that have these
bits set to 0x07.
Bits 3 through 0 of this register are used to determine if
an external bus master access is to local or far memory.
When bits 3 through 0 are set, the corresponding access
is considered local and the MAC/_TESTOUT pin is driven
high. When these bits are clear, the corresponding
access is to far memory and the MAC/_TESTOUT pin is
driven low. This function is enabled after a Transfer
Control SCRIPTS instruction is executed.
DWR DataWR 3
This bit is used to define if a data write is considered to
be a local memory access.
DRD DataRD 2
This bit is used to define if a data read is considered to
be a local memory access.
PSCPT Pointer SCRIPTS 1
This bit is used to define if a pointer to a SCRIPTS
indirect or table indirect fetch is considered to be a local
memory access.
SCPTS SCRIPTS 0
This bit is used to define if a SCRIPTS fetch is
considered to be a local memory access.
7 4 3 2 1 0
TYP DWR DRD PSCPT SCPTS
1 1 1 1 0 0 0 0