F21 die and pinout

Updated 6/3/97

The F21 chip die is about 4x3 mm although much of the space on this die is unused. Their are 68 pads on the die and 68 pins on the chip on the plcc package. The PGA package with 64 pins required the 2x4mm die size. The working die size is about 2mm square. In this size the silicon may be manufactured for only a few cents in large quantity. The cost of packaging with 68 pins will be greater than the cost of the die in large quantity. Other packages for F21 may also be offered.

The F21 chips has 68 pads located around the outsid of the die. These pads are assigned as follows:

                        F21c Packaging

C+               Core Power  (2)
C-               Core Ground (2)
P+               Pads Power  (3)
P-               Pads Ground (3)
A+               Analog Power
A-               Analog Ground
P0-P7            Parallel port i/o
WE               Write Enable
SRAM             Select SRAM
ROM              Select ROM
RAS              Row Address Strobe for DRAM
CAS              Column Address Strobe for DRAM
D0-D9            10 lower data bits
AD10-AD19        10 upper data bits/multiplexed upper address bits for DRAM/ROM
A0-A9            10 lower address bits
A10-A13 (P8-P10) 4 upper address bits for SRAM/parallel port i/o
Ni (P11)         Network input/parallel port i/o
No (P12)         Network output/parallel port i/o
Ci (P19)         Xtal/oscilator clock input/parallel port in bit 19
R                RGB video Red
G                RGB video Green and sync
B                RGB vide Blue
Ao               Analog Output
Ai               Analog Input
Reset            Chip reset line

                           F21c die pads

    8       7      6      5  4  3  2  1  68 67 66 65 64 63  62  61
    A12/P10 A11/P9 A10/P8 P7 P6 C+ C- P5 P4 P3 P2 P1 P0 RAM ROM RAS
9  Reset                                                         CAS 60
10 Ni/P11                                                        P+  59
11 No/P12                                                        P-  58
12 A13/P13                                                       WE  57
13 Ao                                                            A9  56
14 Ai                                                            A8  55
15 Ci                                                            A7  54
16 B                                                             A6  53
17 A+                         F21c Pads                          A5  52
18 R                                                             A4  51
19 G                                                             A3  50
20 A-                                                            A2  49
21 AD19                                                          A1  48
22 AD18                                                          A0  47
23 AD17                                                          D0  46
24 AD16                                                          D1  45
25 AD15                                                          D2  44
26 AD14                                                          D3  43
    AD13 AD12 AD11 AD10 P+  C+  C-  P-  D9  D8 D7 D6 P+ P- D5 D4
    27   28   29   30   31  32  33  34  35  36 37 38 39 40 41 42

PIN-OUT same as die
 F21c Prototypes 68-Pin Ceramic LCC:
 Production F21  68-Pin PLCC:

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