EWIXP425BBT Intel, EWIXP425BBT Datasheet - Page 120

• Manufacturer Part Number: EWIXP425BBT
• Manufacturer: Intel

Specifications of EWIXP425BBT

• Core Operating Frequency: 266MHz
• Package Type: BGA
• Pin Count: 492
• Mounting: Surface Mount
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Operating Temperature Classification: Industrial
• Lead Free Status / Rohs Status: Compliant

5.5.2.7.1
Figure 40.
Intel
Datasheet
120
®
IXP42X Product Line of Network Processors and IXC1100 Control Plane Processor
Note:
EX_IOWAIT_N
I/O Wait Normal Phase Timing
The EX_IOWAIT_N signal is available to be shared by devices attached to chip selects 0
through 7, when configured in Intel or Motorola modes of operation. The main purpose
of this signal is to properly communicate with slower devices requiring more time to
respond during data access. During idle cycles, the board is responsible for ensuring
that EX_IOWAIT_N is pulled-up. The Expansion bus controller will always ignore
EX_IOWAIT_N for synchronous Intel mode writes.
Refer to the Using I/O Wait sub-section in the Expansion Bus Controller chapter of the
Intel
Processor Developer’s Manual for detailed information.
EX_ADDR[23:0]
EX_DATA[15:0]
EX_ IOWAIT_N
EX_CS_ N[0]
Notice that the access is an Intel-style simplex read access. The data strobe phase is set to a value to last
three clock cycles. The data is returned from the peripheral device prior to the three clocks and the
peripheral device de-asserts EX_IOWAIT_N. The data strobe phase terminates after two clocks even though
the strobe phase was configured to pulse for three clocks.
EX_RD_N
®
EX_ CLK
IXP42X Product Line of Network Processors and IXC1100 Control Plane
T1=0 h
1 Cycle
Intel
T2=0 h
1 Cycle
Valid Address
®
IXP42X product line and IXC1100 control plane processors
T3=2h or 1h or 0h
Valid Data
3 Cycles
2 Cycles
Document Number: 252479-006US
T4=0 h
1 Cycle
T5=0 h
1 Cycle
August 2006
B5242 -01