Data
Sheet
(Pre limin ar y)
9.3
Read Identification (RDID)
The Read Identification (RDID) command outputs the one-byte manufacturer identification, followed by the
two-byte device identification, to the host system.
JEDEC assigns the manufacturer identification byte; for Spansion devices it is 01h. The device manufacturer
assigns the device identification: the first byte provides the memory type; the second byte indicates the
memory capacity. See
or
for device ID data.
The host system must first select the device by driving CS# low. The RDID command is then written to SI,
and each bit is latched on the rising edge of SCK. The 24-bit device identification data is output from the
memory array on SO at a frequency f
SCK
, on the falling edge of SCK.
The RDID command sequence is shown in
and
Driving CS# high after the device identification data has been read at least once terminates the READ_ID
command. Driving CS# high at any time during data output also terminates the RDID operation.
The device rejects any RDID command issued while it is executing a program, erase, or Write Status Register
operation, and continues the operation uninterrupted.
Figure 9.3
Read Identification (RDID) Command Sequence and Data-Out Sequence
CS#
SCK
Mode 3
0
1
2
3
4
5
6
7
8
9
10
11 12
13
14 15 16
17 18
28 29 30 31
Mode 0
Command
SI
Manufacturer Identification
SO
Hi-Z
MSB
Device Identification
15 14 13
3
2
1
0
Table 9.1
Read Identification (RDID) Data-Out Sequence
Device Identification
Manufacturer Identification
01h
Memory Type
02h
Memory Capacity
15h
16
S25FL032A
S25FL032A_00_C0 September 1, 2006
SPANSION [ SPANSION ]
