
2
MB86604L
(Continued)
 Two types of high-speed data transfer:
– Synchronous data transfer (Max. 10 Mbytes/s, max. 32 offsets, 32-step transfer rate)
– Asynchronous data transfer (Max. 5 Mbyte/s)
 Transfer parameters (transfer mode, transfer rate, transfer offset) can be set for up to 7 connected devices.
 Single-ended transmission type (Maximum cable length: 6 m):
– On-chip single-ended driver/receiver which can drive 48 mA of "L" level output current
– Directly connectable with the SCSI bus
 On-chip three-state bidirectional buffers for SCSI REQ and ACK pins (DB7-DB0, DBP, ATN, MSG, C/D,
I/O
pins can be selected from either three-state or open-drain buffer by controlling the TEST pins input.)
Transfer Operation:
 Automatic response to selection/reselection (Preset receiving operation can perform at the selection/
reselection.):
– Initiator: Automatically operates until message received without command issue.
– Target: Automatically operates until command received without command issue.
 Automatic receiving:
– Initiator: Automatically receives information for new phase to which target transited without command issue.
– Target: Automatically receives message from initiator when initiator generates attention condition.
 On-chip 32-byte data register (FIFO) for data phase
 On-chip two (send-only and receive-only) 32-byte data buffers for message, command, and status phases
 On-chip 16-bit transfer block register and 24-bit transfer byte register enabling 1 Tbytes transfer (1 Tbytes: 16
Mbytes
× 64 k blocks)
 On-chip independent data transfer bus enabling the MPU operation during the data transfer
 Parity through/generate can be specified.
System Bus Interface:
 8-bit or 16-bit separate MPU and DMA buses
 Directly connectable with a 80 series or 68 series MPU
 Two types of transfer operation:
– Program transfer
– DMA transfer (Burst/Handshake)
Command Set:
 Supports sequential commands and programmable commands in addition to ordinary commands
 Command queuing (Command can be continuously issued by putting tags to commands in command phase.)
 On-chip 256-byte memory for command programming memory and command queuing buffer
Others
 Process: CMOS process
 Supply Voltage: Single +5 V
 Input System Clock: 20 MHz/30 MHz/40 MHz
 Package: 100-pin plastic SQFP