Ddri Sdram Boundary Register 0 Sbr0 - Intel IXP45X Developer's Manual

11.6.5

DDRI SDRAM Boundary Register 0 SBR0

This register indicates the upper boundary of SDRAM bank 0 and its memory
technology. If bank 0 is unpopulated, SBR0[6:0] is programmed either with all zeros or
a number equal to the value in SDBR[31:25]. See
Configurations" on page 590
Note: DDRI SDRAM memory space must never cross a 2-Gbyte boundary.
Note: This register should be read back after being written, before the Intel XScale processor
performs transactions which address the DDRI SDRAM.
Register Name:
Hex Offset Address:
Register Description:
Access: See below.
31 30 29
Register
Bits Name
SDRAM Technology: Defines the memory subsystem technology.
• 00
31:3
• 10
0
• 11
• 01
29:0
(Reserved)
7
SDRAM Boundary: Defines the upper limit of SDRAM bank 0. This
06:0
value is compared with ADDR[31:25] to determine a bank hit or
0
miss.
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Developer's Manual
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for more details and programming examples.
SDRAM Boundary Register 0 - SBR0
CC00 E510H
DDRI SDRAM Boundary Register 0
(Reserved)
SDRAM Boundary Register 0 - SBR0
Description
128 Mbitx8/16, 256 Mbitx8, 512 Mbitx8/16, 1 Gbitx8
256 Mbitx16
1 Gbitx16
Reserved
IXP46X Product Line of Network Processors—Memory Controller
"DDRI SDRAM Bank Sizes and
Reset Hex Value:
0x0000 0000H
07 06 00
Default Access
00 RW
2
0000000H RO
00000 RW
2
August 2006
Order Number: 306262-004US