AM29LV800T datasheet(21/48 Pages) AMD

21 / 48 page

Am29LV800T/Am29LV800B

PRELIMINARY

RESET: Hardware Reset Pin

The RESET pin is an active low signal. A logic ‘0’ on this

pin will force the device out of any mode that is currently

executing back to the reset state. This allows a system

reset to take effect immediately without having to wait for

the device to ﬁnish a long execution cycle. To avoid a po-

tential bus contention during a system reset, the device

is isolated from the data I/O bus by tri-stating the data

output pins for the duration of the RESET pulse.

If RESET is asserted during a program or erase oper-

ation, the RY/BY pin will remain low until the reset op-

eration is internally complete. This will require between

µs and 20 µs. Hence the RY/BY pin can be used to

signal that the reset operation is complete. Otherwise,

allow for the maximum reset time of 20

µs. If RESET is

asserted when a program or erase operation is not ex-

ecuting (RY/BY pin is high), the reset operation will be

complete within 500 ns.

Asserting RESET during a program or erase operation

leaves erroneous data stored in the address locations

being operated on at the time of device reset. These lo-

cations need updating after the reset operation is com-

plete. See Figure 4 for timing speciﬁcations.

The device enters ICC4 standby mode (200 nA) when

VSS ± 0.3 V is applied to the RESET pin.The device can

enter this mode at any time, regardless of the logical

condition of the CE pin. Furthermore, entering ICC4

during a program or erase operation leaves erroneous

data in the address locations being operated on at the

time of the RESET pulse. These locations need updat-

ing after the device resumes standard operations. After

the RESET pin goes high, a minimum latency period of

50 ns must occur before a valid read can take place.

RESET

RY/BY

tRL

20 µs max

20478D-10

Figure 3.

Device Reset During a Program or Erase Operation

0 V

RY/BY

RESET

tRL

20478D-11

Figure 4.

Device Reset During Read Mode

AM29LV800T Datasheet(PDF) 21 Page - Advanced Micro Devices

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