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September 15, 2005 S71WS-N_01_A4
S71WS-Nx0 Based MCPs
31
Advance
Information
10.3.7
Configuration Register
The configuration register sets various operational parameters associated with burst mode. Upon
power-up or hardware reset, the device defaults to the asynchronous read mode, and the config-
uration register settings are in their default state. The host system should determine the proper
settings for the entire configuration register, and then execute the Set Configuration Register
command sequence, before attempting burst operations. The configuration register is not reset
after deasserting CE#. The Configuration Register can also be read using a command sequence
(see Table 15.1). The following list describes the register settings.
Table 10.9 Configuration Register
Reading the Configuration Table. The configuration register can be read with a four-cycle com-
mand sequence. See Table 15.1 for sequence details. Once the data has been read from the
configuration register, a software reset command is required to set the device into the correct
state.
CR Bit
Function
Settings (Binary)
CR15
Set Device Read
Mode
0 = Synchronous Read (Burst Mode) Enabled
1 = Asynchronous Read Mode (default) Enabled
CR14
Reserved
1 = S29WS256N at 6 or 7 Wait State setting
0 = All others
54 MHz
66 Mhz
80 MHz
CR13
Programmable
Wait State
S29WS128N
01
1
011 = Data valid on 5th active CLK edge after addresses
latched
100 = Data valid on 6th active CLK edge after addresses
latched
101 = Data valid on 7th active CLK edge after addresses
latched (default)
110 = Reserved
111 = Reserved
Inserts wait states before initial data is available. Setting
greater number of wait states before initial data reduces
latency after initial data.
(Notes 1, 2)
S29WS256N
CR12
S29WS128N
10
0
S29WS256N
CR11
S29WS128N
10
1
S29WS256N
CR10
RDY Polarity
0 = RDY signal active low
1 = RDY signal active high (default)
CR9
Reserved
1 = default
CR8
RDY
0 = RDY active one clock cycle before data
1 = RDY active with data (default)
When CR13-CR11 are set to 000, RDY is active with data
regardless of CR8 setting.
CR7
Reserved
1 = default
CR6
Reserved
1 = default
CR5
Reserved
0 = default
CR4
Reserved
0 = default
CR3
Burst Wrap Around
0 = No Wrap Around Burst
1 = Wrap Around Burst (default)
CR2
CR1
CR0
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)
Notes:
1. Refer to Tables 10.2 - 10.7 for wait states requirements.
2. Refer to Synchronous Burst Read timing diagrams
3. Configuration Register is in the default state upon power-up or hardware reset.


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