PRIXP425BD datasheet(95/112 Pages) INTEL

95 / 112 page

Intel® IXP42X Product Line and IXC1100 Control Plane Processor

Electrical Specifications

Datasheet

NOTES:

1. EX_ALE is not valid in simplex mode of operation.

2. Setting the address phase parameter (T1) will adjust the duration that the address appears to the external

device.

3. Setting the data setup phase parameter (T2) will adjust the duration that the data appears prior to a data

strobe (read or write) to an external device.

4. Setting the data strobe phase parameter (T3) will adjust the duration that the data strobe appears (read or

write) to an external device. Data will be available during this time as well.

5. Setting the data hold strobe phase parameter (T4) will adjust the duration that the chip selects, address, and

data (during a write) will be held.

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

expansion interface.

7. One cycle is the period of the Expansion Bus clock.

8. Clock to output delay for all signals will be a maximum of 15 ns for devices requiring operation in

synchronous mode.

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

Table 53.

Intel Simplex Mode Values

Symbol

Parameter

Min.

Max.

Units

Notes

Taddr2valcs

Valid address to valid chip select

Cycles

1, 2, 7

Tdval2valwrt

Write data valid prior to EXPB_IO_WRITE_N falling edge

Cycles

3, 7

Twrpulse

Pulse width of the EXP_IO_WRITE_N

Cycles

4, 7

Tdholdafterwr

Valid data after the rising edge of EXPB_IO_WRITE_N

Cycles

5, 7

Trdsetup

Data valid required before the rising edge of

EXP_IO_READ_N

5.3

14.7

Trdhold

Data hold required after the rising edge of

EXP_IO_READ_N

2ns

Trecov

Time required between successive accesses on the

expansion interface.

116

Cycles

Figure 27.

Motorola* Multiplexed Mode

A9587-01

EX_CLK

EX_ADDR

EX_DATA

EX_RD_N

(exp_mot_rnw)

EX_WR_N

(exp_mot_ds_n)

EX_DATA

EX_ALE

Valid Address

1-16 Cycles

1-4 Cycles

EX_CS_N

Trecov

Tale2addrhold

Tdval2valds

EX_WR_N

(exp_mot_ds_n)

EX_RD_N

(exp_mot_rnw)

Tdhold2afterds

1-16 Cycles

1-4 Cycles

2-5 Cycles

ALE Extended

Talepulse Tale2valcs

Tdspulse

Address

Output Data

Address

Input Data

Multiplexed Address/Data

Trdsetup

Trdhold

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