AT25F512B Просмотр технического описания (PDF) - Atmel Corporation
Номер в каталоге
Компоненты Описание
производитель
AT25F512B Datasheet PDF : 34 Pages
| |||
AT25F512B [Preliminary]
Figure 12-1. Read Manufacturer and Device ID
CS
SCK
SI
0
678
OPCODE
9Fh
14 15 16
22 23 24
30 31 32
38
SO
HIGH-IMPEDANCE
1Fh
65h
MANUFACTURER ID
DEVICE ID
BYTE1
00h
DEVICE ID
BYTE2
Note: Each transition
shown for SI and SO represents one byte (8 bits)
00h
EXTENDED
DEVICE
INFORM ATION
STRING LENGTH
12.2
Read ID (Legacy Command)
Identification information can be read from the device to enable systems to electronically query
and identify the device while it is in system. The preferred method for doing so is the JEDEC
standard “Read Manufacturer and Device ID” method described in Section 12.1 on page 20;
however, the legacy Read ID command is supported on the AT25F512B to enable backwards
compatibility to previous generation devices.
To read the identification information, the CS pin must first be asserted and the opcode of 15h
must be clocked into the device. After the opcode has been clocked in, the device will begin out-
putting the identification data on the SO pin during the subsequent clock cycles. The first byte
that will be output will be the Manufacturer ID of 1Fh followed by a single byte of data represent-
ing a device code of 65h. After the device code is output, the SO pin will go into a high-
impendance state; therefore, additional clock cycles will have no affect on the SO pin and no
data will be output.
Deasserting the CS pin will terminate the Read ID operation and put the SO pin into a high-
impedance state. The CS pin can be deasserted at any time and does not require that a full byte
of data read.
Figure 12-2. Read ID (Legacy Command)
CS
SCK
SI
SO
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
OPCODE
00010101
MSB
MANUFACTURER
ID
DEVICE
CODE
HIGH-IMPEDANCE
0001111101100101
MSB
MSB
21
3689C–DFLASH–12/08
Share Link: 