Force SYS68K/CPU-30 R4, Техническое справочное руководство

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Hardware Description SYS68K/CPU-30 R4 Technical Reference Manual
Page 78
CAUTION: PI/T #2 pin PC2 must be programmed as an input.
3.10.20 Floppy Drive
Write Protect
Signal at PI/T #2
PC4:
From this line the status of the write protection for the System Flash
Memory may be monitored.
CAUTION: PI/T #2 pin PC4 must be programmed as an input.
CAUTION: Writes to the System Flash Memory must always be
performed with a 4-byte wide port size and must be aligned on 4-byte
boundaries.
3.10.21 DMA Control
Line at PI/T #2
PC5:
This line controls the local devices when a DMA transfer is in progress.
When the DMA controller accesses a local device (SCSI or FDC), this
line must be set to "0".
SEE ALSO: There are two other DMA Control Lines (controlling the
local peripheral bus) which are described in Section 3.10.6, ‘DMA
Control Lines at PI/T #1,’ on page 72.
3.10.22 Flash
Programming
Control at PI/T #2
PC6:
A 12V-Vpp-Generator must be controlled to support programming of the
System Flash Memory and the Boot PROM memory in the default Boot
PROM socket.
PC2 Function
0 Write to Boot PROM unprotected
1 Write to Boot PROM protected
PC4 Function
0 Write to System Flash Memory unprotected
1 Write to System Flash Memory protected
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