S75WS256NDFBAWMB datasheet(115/216 Pages) SPANSION

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February 17, 2005 S75WS-N-00_00_A0

S75WS256Nxx Based MCPs

113

Data

Sheet

19.4 Configuration Register

Table 19.9 shows the address bits that determine the configuration register settings for various

device functions.

Note: 3.Device will be in the default state upon power-up or hardware reset.

Table 19.9 Configuration Register

CR0. Bit

Function

Settings (Binary)

CR0.15 Set Device Read Mode 0 = Synchronous Read (Burst Mode) Enabled

1 = Asynchronous Mode (default)

CR0.14

Boundary Crossing

0 = No extra boundary crossing latency

1 = With extra boundary crossing latency (default)

CR1.0

Programmable

Wait State

0000 = Reserved

0001 = Data is valid on the 4th active CLK edge after addresses are latched

0010 = Data is valid on the 5th active CLK edge after addresses are latched

0011 = Data is valid on the 6th active CLK edge after addresses are latched

0100 = Data is valid on the 7th active CLK edge after addresses are latched

0101 = Data is valid on the 8th active CLK edge after addresses are latched

0110 = Reserved

0111 = Reserved

1000 = Data is valid on the 9th active CLK edge after addresses are latched

1001 = Data is valid on the 10th active CLK edge after addresses are latched

1010 = Data is valid on the 11th active CLK edge after addresses are latched

1011 = Data is valid on the 12th active CLK edge after addresses are latched

1100 = Data is valid on the 13th active CLK edge after addresses are latched (default)

1101 = Data is valid on the 14th active CLK edge after addresses are latched

1110 = Reserved

1111 = Reserved

CR0.13

CR0.12

CR0.11

CR0.10

RDY Polarity

0 = RDY signal is active low

1 = RDY signal is active high (default)

CR0.9

Reserved

1 = default

CR0.8

RDY

0 = RDY active one clock cycle before data

1 = RDY active with data (default)

CR0.7

Reserved

1 = default

CR0.6

Reserved

1 = default

CR0.5

Reserved

0 = default

CR0.4

Reserved

0 = default

CR0.3

Burst Wrap Around

0 = No Wrap Around Burst

1 = Wrap Around Burst (default)

CR0.2

Burst Length

000 = Continuous (default)

010 = 8-Word Linear Burst

011 = 16-Word Linear Burst

100 = 32-Word Linear Burst

(All other bit settings are reserved)

CR0.1

CR0.0

S75WS256NDFBAWMB Datasheet(PDF) 115 Page - SPANSION

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