LSI Logic Confidential
9-4
Secondary Bitstream Interface
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
9.1.2
Bitstream Input – Incoming Transfers (BSRD = 0)
When the SBP is a bitstream input for WRREQ = 0:
•
SBP_REQ is asserted on each clock in which the bitstream FIFO is
empty (not full).
•
SBP_RD is LOW to indicate the direction of the transfer.
When SBP_ACK is asserted by the system in a clock in which SBP_REQ
is asserted, one byte of bitstream data is added to the FIFO at the end
of the clock. As long as the DMA operation is enabled and SBP_CLK is
running at 27 MHz or slower while the DMN-8600 internal clock is
running at 148.5 MHz, SBP_REQ will be asserted continuously. This
allows a non-flow-controlled transfer to be used, if necessary.
shows incoming transfers to the bitstream port with
WRREQ = 0, POL = 1 and BSRD = 0. In the figure, note that SBP_ACK
and SBP_REQ are shown as active LOW. The system drives SBP_DATA.
Figure 9.3
Bitstream Port Incoming Transfers with WRREQ = 0,
POL = 1 and BSRD = 0
When SBP_ACK is asserted by the system in a clock in which SBP_REQ
is asserted, one byte of bitstream data is added to the FIFO at the end
of the clock. As long as the DMA operation is enabled and SBP_CLK is
running at 27 MHz or slower while the DMN-8600 internal clock is
running at 148.5 MHz, SBP_REQ will be asserted continuously. This
allows a non-flow-controlled transfer to be used, if necessary.
SBP_CLK
SBP_REQ
SBP_RD
SBP_ACK
SBP_DATA
Data
Data
Data
Содержание DMN-8600
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