LSI Logic Confidential
8-10
Host Slave Interface
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
H_DMAREQ pin uses an edge-sensitive protocol as described in the
following two subsections.
8.4.1
Incoming Transfers to DMN-8600 Device
When BSRD = 0 in the Host Configuration register, the Host transfers
bitstreams to the DMN-8600 device as follows:
•
H_DMAREQ is asserted when there is space in the bitstream FIFO
and a DMA transfer is active.
•
H_DMAREQ is deasserted on the falling edge of a write strobe (WR
in I-mode, CS in M-mode) and data is sent to the Host DMA Data
Register.
•
H_DMAREQ is reasserted as early as the next rising edge of the
write strobe if there is remaining space in the FIFO and additional
data is still required to complete the DMA transfer.
•
Any data sent when H_DMAREQ is deasserted is ignored and lost.
8.4.2
Outgoing Transfers from DMN-8600 Device
When BSRD = 1 in the Host Configuration register, the Host receives
bitstreams from the DMN-8600 device as follows:
•
H_DMAREQ is asserted when there is data in the bitstream FIFO.
•
H_DMAREQ is deasserted on the falling edge of a read strobe (RD
in I-mode, CS in M-mode) to the Host DMA Data register.
•
H_DMAREQ is reasserted as early as the rising edge of the read
strobe if there is additional data in the bitstream FIFO.
•
Any DMA read that occurs when H_DMAREQ is deasserted will
result in undetermined data (that is, spurious data).
8.5
Power Management
When DMN-8600 is in standby mode, asserting the CS pin causes a chip
reset, which clears standby mode and reactivates the internal PLL.
Содержание DMN-8600
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