EN27C010
4800 Great America Parkway Ste 202
Tel: 408-235-8680
Santa Clara, CA. 95054
Fax: 408-235-8685
4
PROGRAM INHIBIT MODE
Programming of multiple EN27C010 in parallel with different data is also easily accomplished
by using the Program Inhibit Mode. Except for
CE , all like inputs of the parallel EN27C010
may be common. A TTL low-level program pulse applied to an EN27C010
CE input with
VPP = 12.75 ± 0.25V, PGM LOW, and OE HIGH will program that EN27C010. A high-level
CE input inhibits the other EN27C010 from being programmed.
PROGRAM VERIFY MODE
Verification should be performed on the programmed bits to determining that they were
correctly programmed. The verification should be performed with
OE and CE at VIL, PGM at
VIH, and VPP at it programming voltage.
AUTO PRODUCT IDENTIFICATION
The Auto Product Identification mode allows the reading out of a binary code from an EPROM that
will identify its manufacturer and type. This mode is intended for use by programming equipment
for the purpose of automatically matching the device to be programmed with its corresponding
programming algorithm. This mode is functional in the 25
°C ± 5°C ambient temperature range
that is required when programming the EN27C010.
To activate this mode, the programming equipment must force 12.0 V
± 0.5V on address line A9
of the EN27C010. Two identifier bytes may then be sequenced from the device outputs by
toggling address line A0 from VIL to VIH, when A1 = VIH. All other address lines must be held at
VIL during Auto Product Identification mode.
Byte 0 (A0 = VIL) represents the manufacturer code, and byte 1 (A0 = VIH), the device code. For
the EN27C010, these two identifiers bytes are given in the Mode Select Table. All identifiers for
manufacturer and device codes will possess odd parity, with the MSB (DQ7) defined as the parity
bit. When A1 = VIL, the EN27C010 will read out the binary code of 7F, continuation code, to
signify the unavailability of manufacturer ID codes.
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