M58WR064HT datasheet(40/111 Pages) NUMONYX

Part #	M58WR064HT

Description	64 Mbit (4Mb x16, Multiple Bank, Burst) 1.8V supply Flash memories

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Manufacturer	NUMONYX [Numonyx B.V]

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Configuration Register

M58WR064HT, M58WR064HB

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8.4

Data Output Configuration Bit (CR9)

The Data Output Configuration bit determines whether the output remains valid for one or

two clock cycles. When the Data Output Configuration Bit is ’0’ the output data is valid for

one clock cycle, when the Data Output Configuration Bit is ’1’ the output data is valid for two

clock cycles.

The Data Output Configuration depends on the condition:

●

tK > tKQV + tQVK_CPU

where tK is the clock period, tQVK_CPU is the data setup time required by the system CPU

and tKQV is the clock to data valid time. If this condition is not satisfied, the Data Output

Configuration bit should be set to ‘1’ (two clock cycles). Refer to Figure 5: X-Latency and

data output configuration example.

8.5

Wait Configuration Bit (CR8)

In burst mode the Wait bit controls the timing of the Wait output pin, WAIT. When WAIT is

asserted, Data is Not Valid and when WAIT is de-asserted, Data is Valid. When the Wait bit

is ’0’ the Wait output pin is asserted during the wait state. When the Wait bit is ’1’ the Wait

output pin is asserted one clock cycle before the wait state.

8.6

Burst Type Bit (CR7)

The Burst Type bit is used to configure the sequence of addresses read as sequential or

interleaved. When the Burst Type bit is ’0’ the memory outputs from interleaved addresses;

when the Burst Type bit is ’1’ the memory outputs from sequential addresses. See Table 11:

Burst type definition, for the sequence of addresses output from a given starting address in

each mode.

8.7

Valid Clock Edge Bit (CR6)

The Valid Clock Edge bit, CR6, is used to configure the active edge of the Clock, K, during

Synchronous Burst Read operations. When the Valid Clock Edge bit is ’0’ the falling edge of

the Clock is the active edge; when the Valid Clock Edge bit is ’1’ the rising edge of the Clock

is active.

8.8

Wrap Burst Bit (CR3)

The burst reads can be confined inside the 4 or 8 Word boundary (wrap) or overcome the

boundary (no wrap). The Wrap Burst bit is used to select between wrap and no wrap. When

the Wrap Burst bit is set to ‘0’ the burst read wraps; when it is set to ‘1’ the burst read does

not wrap.

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