M58WR064HT datasheet(48/111 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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Read modes

M58WR064HT, M58WR064HB

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9.3

Synchronous Burst Read Suspend

A Synchronous Burst Read operation can be suspended, freeing the data bus for other

higher priority devices. It can be suspended during the initial access latency time (before

data is output), or after the device has output data. When the Synchronous Burst Read

operation is suspended, internal array sensing continues and any previously latched internal

data is retained. A burst sequence can be suspended and resumed as often as required as

long as the operating conditions of the device are met.

A Synchronous Burst Read operation is suspended when E is low and the current address

has been latched (on a Latch Enable rising edge or on a valid clock edge). The clock signal

is then halted at VIH or at VIL, and G goes high.

When G becomes low again and the clock signal restarts, the Synchronous Burst Read

operation is resumed exactly where it stopped.

WAIT being gated by E remains active and will not revert to high-impedance when G goes

high. So if two or more devices are connected to the system’s READY signal, to prevent bus

contention the WAIT signal of the Flash memory should not be directly connected to the

system’s READY signal.

See Table 23: Synchronous Read AC characteristics and Figure 13: Synchronous Burst

Read Suspend AC Waveforms, for details.

9.4

Single Synchronous Read Mode

Single Synchronous Read operations are similar to Synchronous Burst Read operations

except that only the first data output after the X latency is valid. Synchronous Single Reads

are used to read the Electronic Signature, Status Register, CFI, Block Protection Status,

Configuration Register Status or Protection Register. When the addressed bank is in Read

CFI, Read Status Register or Read Electronic Signature mode, the WAIT signal is always

asserted.

See Table 23: Synchronous Read AC characteristics and Figure 12: Single Synchronous

Read AC Waveforms, for details.

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