GCIXP1250BC 837414 Intel, GCIXP1250BC 837414 Datasheet - Page 21

• Manufacturer Part Number: GCIXP1250BC 837414
• Manufacturer: Intel

Specifications of GCIXP1250BC 837414

• Lead Free Status / Rohs Status: Supplier Unconfirmed

2.5.6.3
2.5.6.4
Datasheet
Table 8. BootROM x32 Sample Configurations
Table 9. BootROM x16 Sample Configurations
BootROM Configurations
SRAM Bus Access Behavior
•
•
•
•
•
512 Kbytes - 4 Mbytes
1 Mbytes - 4 Mbytes
2Mbytes - 4 Mbytes
The SRAM controller within the IXP1250 will never initiate automatic bursting. Bursting is
controlled by the requestor (StrongARM* core or Microengine) depending on the type and
number of SRAM accesses needed.
Accesses are always longword 32-bit cycles on the SRAM Bus.
The IXP1250 always drives the address for each data cycle. No external address generation or
address advance control to SRAM devices is required.
Accesses from the StrongARM* core:
Accesses from the Microengines:
— Byte, word, and longword accesses generated from the StrongARM* core are supported.
— Bit operations are supported via StrongARM* core accesses to the SRAM Alias Address
— Bit, byte, and word writes result in Read-Modify-Write cycles.
— Declare memory-mapped I/O as non-cacheable to prevent line fill burst cycles, and
— For best performance, use longword accesses to avoid Read-Modify-Write cycles on the
Total Memory
Total Memory
512 Kbytes
256 Kbytes
512 Kbytes
2 Mbytes
4 Mbytes
6 Mbytes
8 Mbytes
1 Mbytes
Space to perform the same operations as a Microengine can accomplish implicitly in a
microinstruction (Push, Pop, Bit Test and Set, CAM operations, Lock/Unlock, etc.).
disable caching and write buffering to ensure I/O device coherency.
SRAM Bus that occur with byte and word accesses.
Number of Chips
Number of Chips
(Maximum of 8)
(Maximum of 8)
2 - 8
2 - 8
2 - 4
2
8
8
6
8
1
1
1
Size of Boot ROM
Size of Boot ROM
Intel
2 Mbit
2 Mbit
4 Mbit
8 Mbit
8 Mbit
2 Mbit
2 Mbit
4 Mbit
4 Mbit
8 Mbit
8 Mbit
®
IXP1250 Network Processor
Device Organization
Device Organization
128 K x 16-bit
128 K x 16-bit
256 K x 16-bit
512 K x 16-bit
512 K x 16-bit
128 K x 16-bit
128 K x 16-bit
256 K x 16-bit
256 K x 16-bit
512 K x 16-bit
512 K x 16-bit
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