Intel 8XC251SQ User Manual
14-9
PROGRAMMING AND VERIFYING NONVOLATILE MEMORY
14.7 VERIFYING THE 83C251SA, SB, SP, SQ (ROM)
Nonvolatile memory on the 83C251Sx controller is factory-programmed. The verification proce-
dure for the 83C251Sx is exactly the same as for the 87C251Sx. The setup shown in Figure 14-1
applies, as do the waveform and timing diagrams. Like the 87C251Sx, the 83C251Sx has 8-
Kbytes or 16-Kbytes of on-chip code memory and a 128-byte encryption array.
dure for the 83C251Sx is exactly the same as for the 87C251Sx. The setup shown in Figure 14-1
applies, as do the waveform and timing diagrams. Like the 87C251Sx, the 83C251Sx has 8-
Kbytes or 16-Kbytes of on-chip code memory and a 128-byte encryption array.
For information on verifying the contents of nonvolatile memory on the 83C251Sx, see 14.6,
“Programmable Functions” for each function desired. Or more directly, perform the verification
procedure described in 14.5, “Verify Algorithm,” using the appropriate verify mode (Table 14-1).
“Programmable Functions” for each function desired. Or more directly, perform the verification
procedure described in 14.5, “Verify Algorithm,” using the appropriate verify mode (Table 14-1).
Table 14-3. Contents of the Signature Bytes
ADDRESS
CONTENTS
DEVICE TYPE
30H
89H
Indicates Intel Devices
31H
40H
Indicates MCS 251 core product
60H
7AH
Indicates 83C251SA device
60H
7BH
Indicates 83C251SB device
60H
4AH
Indicates 83C251SP device
60H
4BH
Indicates 83C251SQ device
60H
FAH
Indicates 87C251SA device
60H
FBH
Indicates 87C251SB device
60H
CAH
Indicates 87C251SP device
60H
CBH
Indicates 87C251SQ device
61H
55H
Indicates 8XC251SA, SB, SP, SQ