CS89712-CB View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CS89712-CB

High-Performance, Low-Power System-on-Chip with 10BASE-T Ethernet Controller

Cirrus Logic 

CS89712

EXPCLK

nCS[5:0]

nMOE

A[27:4]

A[3:0]

WORD

D[31:0]

Bus held

EXPRDY

tEXBST

tEXBST

0

4

8

t1

tEXRD

t3 t4

Data in

t3 t4

Data in

t3 t4

Data in

t5

t6

Notes:

1.tEXBST = 35 ns at 36.864 MHz

35 ns at 18.432 MHz

(Value for 36.864 MHz assumes 1 wait state.)

Maximum values for minimum wait states. This time can be extended by integer multiples of the

clock period (27 nsec at 36 MHz or 54 nsec at 18.432 MHz), by either driving EXPRDY low and/or

by programming a number of wait states. EXPRDY is sampled on the falling edge of EXPCLK before

the data transfer. If low at this point, the transfer is delayed by one clock period where EXPRDY is

sampled again. EXPCLK need not be referenced when driving EXPRDY, but is shown for clarity.

2. Consecutive reads with sequential access enabled are identical except that the sequential access

wait state field is used to determine the number of wait states, and no idle cycles are inserted

between successive non-sequential ROM/expansion cycles. This improves performance so the

SQAEN bit should always be set where possible.

Figure 25. Sequential Page Mode Read Cycles with Minimum Wait States

DS502PP2

153

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