IXP2400 Intel, IXP2400 Datasheet - Page 17

• Manufacturer Part Number: IXP2400
• Manufacturer: Intel

Specifications of IXP2400

• Operating Supply Voltage (typ): 1.3/1.5/2.5/3.3V
• Mounting: Surface Mount
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Operating Temperature Classification: Industrial
• Lead Free Status / Rohs Status: Not Compliant

2.5
Datasheet
Table 1.
of physical memory is present, the upper part of the address space is not utilized. Read and writes
to DRAM generated by the MEs, the Intel XScale core, and PCI units, are presented as requests to
the DDR controller, which enqueues them to their respective bank(s).
Error Correction Code (ECC) is supported. Each 64 bits (8 bytes) has an 8-bit ECC associated with
it, thus all single bit errors are corrected while multiple bit errors are detected and optionally
reported. The ECC operation can be disabled. When ECC is enabled, partial writes (writes of less
than 8 bytes) will be performed as read-modify-write by the DDR controller.
DDR Supported Configurations
SRAM
The IXP2400 has two independent SRAM controllers, each of which supports pipelined QDR
synchronous static RAM (SRAM) and/or a coprocessor that adheres to QDR signaling. Either
controller can be left unused if the application does not need to use its SRAM channels, which are
accessible by the Microengines, the Intel XScale core, and the PCI Unit (external bus masters).
The memory is logically four bytes (32 bits) wide; physically the data pins are two bytes wide and
are double clocked. Byte parity is supported. Each of the four bytes has a parity bit, which is
generated when the byte is written and checked when the data is read. There are byte enables that
select which bytes to write for writes of less than 32 bits.
Examples of supported SRAMs are:
Capacity
Memory
128 MB
256 MB
512 MB
1.0 GB
2.0 GB
64 MB
128 Mbit
128 Mbit
128 Mbit
256 Mbit
128 Mbit
256 Mbit
256 Mbit
512 Mbit
256 Mbit
512 Mbit
512 Mbit
512 Mbit
Density
1.0 Gbit
1.0 Gbit
1.0 Gbit
1.0 Gbit
64 Mbit
64 Mbit
DRAM
Width
Part
x16
x16
x16
x16
x16
x16
x16
x16
x16
x 8
x 8
x8
x8
x8
x8
x8
x8
x8
Number of
SDRAMs
Total
18
10
18
10
10
18
10
18
10
18
9
5
9
5
5
9
5
9
of DIMMs
Number
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Number
Intel
Sides
of
1
1
2
1
2
1
2
2
2
1
2
1
2
1
2
1
2
2
®
IXP2400 Network Processor
DIMM vendors shown)
Comments (sample
Samsung*, Micron*
Samsung*, Micron*
Samsung*, Micron*
Samsung*
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