11 chained block moves, Chained block moves, Block move and chained block move instructions – Avago Technologies LSI53C876E User Manual
Page 62
2-40
Functional Description
2.2.11 Chained Block Moves
Since the LSI53C876 has the capability to transfer 16-bit wide SCSI
data, a unique situation occurs when dealing with odd bytes. The
chained move (CHMOV) SCRIPTS instruction along with the Wide SCSI
Send (WSS) and Wide SCSI Receive (WSR) bits in the
register are used to facilitate these situations. The
Chained Block Move instruction is illustrated in
.
Figure 2.8
Block Move and Chained Block Move Instructions
CHMOV 5, 3 when Data_Out
Moves five bytes from address 0x03 in the host memory to the SCSI bus.
Bytes 0x03, 0x04, 0x05, and 0x06 are moved and byte 0x07 remains in
the low-order byte of the
register and
is combined with the first byte of the following MOVE instruction.
Move 5, 9 when Data_Out
Moves five bytes from address 0x09 in the host memory to the SCSI bus.
0x03
0x02
0x01
0x00
0x07
0x06
0x05
0x04
0x0B 0x0A
0x09
0x08
0x0F
0x0E 0x0D 0x0C
0x13
0x12
0x11
0x10
0x04
0x03
0x06
0x05
0x09
0x07
0x0B 0x0A
0x0D 0x0C
32 Bits
16 Bits
Host Memory
SCSI Bus
00
04
08
0C
10