The Flash Eproms
- Gunther Strube
The Flash Eprom cards are a new device for Z88 storage. Its main feature is an integrated electrical erasure. The prototype card used the Intel 28F008SA and the production cards used initially the Intel 28F008S5 (which is fastest). When Intel stopped manufacturing these, AMD (now Spansion) manufactured a similar chip, same size and format. The Vpp pin became redundant (NC not connected). Unlike the Intel chip, this was a 5v only device which meant that they could be written to in any of the Z88's 3 slots. Both the Intel and AMD chips had 44 pins in a PSOP (or SO) format (0.5 mm between each pin). Spansion stopped manufacturing this package and changed it to a 40pin Standard TSOP. Both packages are shown below. They are wired to the slot connector like the standard EPROM.
+--------------+ +-------------------------------+
VPP |1 +--+ 44| VCC A19 |1 +--+ 40| -
RP# |2 43| CE# A18 |2 39| -
A11 |3 42| A12 A17 |3 38| WE#
A10 |4 41| A13 A16 |4 37| OE#
A9 |5 40| A14 A15 |5 36| -
A8 |6 39| A15 A14 |6 35| D7
A7 |7 38| A16 A13 |7 34| D6
A6 |8 37| A17 A12 |8 33| D5
A5 |9 36| A18 CE# |9 32| D4
A4 |10 35| A19 VCC |10 31| VCC
- |11 Intel 34| - - |11 Spansion / AMD 30| GND
- |12 28F008 33| - RP# |12 Am29F080B 29| GND
A3 |13 SA/S5 32| - A11 |13 40-pin TSOP 28| D3
A2 |14 31| - A10 |14 27| D2
A1 |15 30| WE# A9 |15 26| D1
A0 |16 29| OE# A8 |16 25| D0
D0 |17 28| - A7 |17 24| A0
D1 |18 27| D7 A6 |18 23| A1
D2 |19 26| D6 A5 |19 22| A2
D3 |20 25| D5 A4 |20 21| A3
GND |21 24| D4 +-------------------------------+
GND |22 23| VCC
+--------------+
The table below describes the connections between the edge connector and the chip.
Slot signal Flash Signal Flash Signal (TSOP)
1 MA16 A16 38 4
2 MA15 A15 39 5
3 MA12 A12 42 8
4 MA7 A7 7 17
5 MA6 A6 8 18
6 MA5 A5 9 19
7 MA4 A4 10 20
8 MA3 A3 13 21
9 MA2 A2 14 22
10 MA1 A1 15 23
11 MA0 A0 16 24
12 MDA D0 17 25
13 MDB D1 18 26
14 MDC D2 19 27
15 SNS
16 GND GND 21 29
17 GND GND 22 30
18 MA14 A14 40 6
19 VPP VPP 1
20 VCC VCC 44,23 31,10
21 VCC -
22 PGM WE# 30 38
23 MA13 A13 41 7
24 MA8 A8 6 16
25 MA9 A9 5 15
26 MA11 A11 3 13
27 POE -
28 EOE OE# 29 37
29 MA10 A10 4 14
30 SE3 CE# 43 9
31 MDH D7 27 35
32 MDG D6 26 34
33 MDD D3 20 28
34 MDE D4 24 32
35 MDF D5 25 33
36 MA17 A17 37 3
37 MA18 A18 36 2
38 MA19 A19 35 1
Other pins:
RP# connected to VCC Pin 2 : Pin 12
Pin 1 : Vpp
Pin 23: Vcc
Pin 44: Vcc
Must be connected to a 100nF ceramic capacitor.
NB: all the VCC and GND pins have to be connected.