LSI Logic Confidential
9-2
Secondary Bitstream Interface
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
Figure 9.1
Secondary Bitstream Port (SBP)
Both SBP_ACK, SBP_REQ and SBP_RD signals can be either active
LOW or active HIGH depending upon the setting of the POL bit and the
WRREQ bit. The BSRD bit determines the direction of the Secondary
Bitstream port. See
for transfer direction and active state
details.
External
Device
SBP_CLK
CLK
SBP_ACK
SBP_RD
SBP_REQ
SBP_DATA[7:0]
SBP_FRAME
DoMiNo
SDRAM
SBP
Table 9.1
Secondary Bitstream Pin Configuration
Bit Setting
Pin Name
BSRD=0 Incoming
BSRD=1 Outgoing
POL=0
POL=1
POL=0
POL=1
WRREQ = 0
SBP_ACK
active HIGH
active LOW
active HIGH
active LOW
SBP_REQ
active HIGH
active LOW
active HIGH
active LOW
SBP_RD
0
0
1
1
WRREQ = 1
SBP_ACK
active HIGH
active LOW
active HIGH
active LOW
SBP_REQ
0
1
active HIGH
active LOW
SBP_RD
active HIGH
active LOW
0
1