GWIXP425BCT datasheet(117/134 Pages) INTEL

117 / 134 page

Intel® IXP42X Product Line of Network Processors and IXC1100 Control Plane Processor

Datasheet

March 2005

Document Number: 252479, Revision: 005

117

Table 60.

HPI-16 Multiplexed Write Accesses Values

Symbol

Parameter

Min.

Max.

Units

Notes

Tadd_setup

Valid time that address is asserted on the line. The address

is asserted at the same time as chip select.

Cycles

1, 5, 6

Tcs2hds1val

Delay from chip select being active and the HDS1 data

strobe being active.

Cycles

5, 6

Thds1_pulse

Pulse width of the HDS1 data strobe.

Cycles

2, 4, 5

Tdata_setup

Data valid prior to the rising edge of the HDS1 data strobe.

Cycles

3, 5, 6

Tdata_hold

Data valid after the rising edge of the HDS1 data strobe.

Cycles

3, 6

Trecov

Time required between successive accesses on the

expansion interface.

217

Cycles

4, 6

Notes:

The address phase parameter (T1) must be set to a minimum value of 2. This value allows three T

clocks for the address phase. This setting is required to ensure that in the event of an HRDY, the

Intel® IXP42X Product Line and Intel® IXC1100 Control Plane processors has had sufficient time to

recognize the HRDY and hold the address phase for at least one clock pulse after the HRDY is de-

active.

The data setup phase parameter (T2) must be set to a minimum value of 2. This value allows three T

clocks for setup phase.

The data strobe phase parameter (T3) must be set to a minimum value of 1. This value allows two T

clocks for the data phase. This setting is required to ensure that in the event of an HRDY, the Intel®

IXP42X Product Line and Intel® IXC1100 Control Plane processors has had sufficient time to

recognize the HRDY and hold the data setup phase for at least one clock pulse after the HRDY is de-

active.

Setting the recovery phase parameter (T5) will adjust the duration between successive accesses on

the Expansion Bus interface.

HRDY can be asserted by the DSP at any point in the access. The interface will not leave states T1 or

T3 until HRDY is de-active.

One cycle is the period of the Expansion Bus clock.

Timing tests were performed with a 70-pF capacitor to ground.

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