LSI Logic Confidential
9-6
Secondary Bitstream Interface
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
•
When packet framing is enabled, the number of clocks from the start
of one outgoing packet to the start of the next outgoing packet is
determined by both the PACKDELAY register and the PACKSIZE
register. Only when both of their values are equal can the next
outgoing SBP_FRAME be asserted.
9.3.2
Incoming FRAME Transfers
below displays incoming FRAME transfers.
Figure 9.5
Incoming FRAME Transfers
For incoming FRAME transfers (BSRD = 0), the following occurs:
•
After each PACKSIZE byte is captured (long packet), incoming bytes
are discarded until SBP_FRAME is asserted.
•
If SBP_FRAME is asserted before PACKSIZE bytes are captured
(Early Frame):
–
Zero bytes are inserted to fill out PACKSIZE bytes in the SDRAM
(preserving the packet boundary alignment in the SDRAM).
–
SBP_REQ is deasserted the cycle after Early Frame until zero
stuffing in completed.
–
After zero stuffing is completed, capture resumes on the next
packet boundary.
•
If zero stuffing occurs and the contents of the Next Address register
equals the contents of the Stop Address register:
–
The GO bit in the bitstream configuration is cleared.
d0
d1
SBP_CLK (I)
SBP_FRAME (I)
SBP_REQ (O)
SBP_ACK (I)
SBP_DATA (I)
SBP_RD (O)
d2
d3
d4
d5
d6
Содержание DMN-8600
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