Rev. 5.00, 12/03, page 726 of 1088
17.28.2
PROM Mode Operation
Table 17-57 shows the settings for the operating modes of PROM mode, and table 17-58 lists the
commands used in PROM mode. The following sections provide detailed information on each
mode.
•
Memory-read mode: This mode supports reading, in units of bytes, from the user MAT or user
boot MAT.
•
Auto-program mode: This mode supports the simultaneous programming of the user MAT and
user boot MAT in 128-byte units. Status polling is used to confirm the end of automatic
programming.
•
Auto-erase mode: This mode only supports the automatic erasing of the entire user MAT or
user boot MAT. Status polling is used to confirm the end of automatic erasing.
•
Status-read mode: Status polling is used with automatic programming and automatic erasure.
Normal completion can be detected by reading the signal on the I/O
6
pin. In status-read mode,
error information is output when an error has occurred.
Table 17-57 Settings for Each Operating Mode of PROM Mode
Pin Name
Mode
CE
CE
CE
CE
OE
OE
OE
OE
WE
WE
WE
WE
I/O7 to 0
A18 to 0
Read
L
L
H
Data output
Ain
Output disable
L
H
H
Hi-Z
X
Command write
L
H
L
Data input
Ain
*
2
Chip disable
*
1
H
X
X
Hi-Z
X
Notes: 1. The chip-disable mode is not a standby state; internally, it is an operational state.
2. Ain indicates that there is also an address input in auto-program mode.
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