LSI Logic Confidential
9-8
Secondary Bitstream Interface
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
The bitstream is located in SDRAM between the Base Address and the
Limit Address. When the bitstream transfer starts, the SDRAM address
is in the Next Address register. The Next Address is then incremented;
it points to the next transfer address after the current SDRAM access has
completed.
If the Next Address reaches the Stop Address, the transfer is completed.
If the Next Address reaches the Limit Address, the next SDRAM address
is the Base Address.
Section 9.5, “Secondary Bitstream Interface
describes the Next Address, Stop Address, Base Address,
and Limit Address registers in detail with respect to the SBP.
9.5
Secondary Bitstream Interface Registers
All secondary bitstream interface registers are 32-bit CBus registers
which are accessible to the SPARC core or Host interface using 32-bit
loads or stores.
9.5.1
Secondary Bitstream Configuration Register
This register resides at memory space address 0x080820. The
Secondary Bitstream Configuration register specifies Secondary
Bitstream configuration information.
Secondary Bitstream Configuration Register
CBus Address: 0x080820
WRREQ
6
If WRREQ is set, the SBP_REQ pin is redefined as a
DMA write request, which is only asserted on outgoing
transfers when the bitstream FIFO is not empty.
31
16
Reserved
15
7
6
5
4
3
2
1
0
Reserved
WRREQ
FP
IE
GO
POL
BSRD WRData
Содержание DMN-8600
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