LSI Logic Confidential
Secondary Bitstream Interface Registers
9-11
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
BSRD
Bitstream READ
1
If BSRD is set, the Secondary Bitstream transfers are
read by the system. The DMN-8600 processor outputs
the bitstream.
If BSRD is clear, then the system writes Secondary
Bitstream transfers. BSRD should not be changed while
the GO bit is set. All bits in this register are set to zero
on reset.
1 = DMN-8600 processor outputs the bitstream
0 = System writes the SBP transfers
WRData
WRITE Data
0
The value of this bit is written to any selected bits during
Secondary Bitstream Configuration Register writes. Bits
to be written are selected by placing a 1 in each desired
location as the register is written. Any bit positions that
contain a 0 during register writes remain unchanged.
Value is written to selected bits.
9.5.2
Secondary NextAddress Register (CBus Addr: 0x080824)
This register at control bus address 0x080824 specifies the SDRAM
address for secondary bitstream data. When GO is set, this register
specifies the starting SDRAM address where secondary bitstream data
will be transferred. As bitstream data is transferred, this register is
updated to point to one byte after the last transferred byte in SDRAM.
This register is read by microcode to determine how many bytes of
bitstream information have been transferred. The two least significant bits
and the upper four bits of this register must be zero.
9.5.3
Secondary Stop Address Register (Cbus Addr: 0x080828)
This register at control bus address 0x080828 specifies the transfer stop
SDRAM address for secondary bitstream data. When the value in the
Next Address reaches the value in this register and the bitstream data
has been transferred to SDRAM or the system, the DMA transfer is
completed and the GO bit is cleared. This register can be reloaded while
a DMA transfer is active to extend the length of a DMA operation. In a
normal operation, this register should never be greater than or equal to
Limit Address register. The two least significant and the upper four bits
of this register must be zero.
Содержание DMN-8600
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