ACE25C100G Datasheet, PDF (24/37 Pages) ACE Technology Co., LTD. – Uniform Sector Dual and Quad Serial Flash

ACE25C100G
Uniform Sector Dual and Quad Serial Flash
Read Manufacture ID/ Device ID (REMS) (90H)
The Read Manufacturer/Device ID command is an alternative to the Release from Power-Down/
Device ID command that provides both the JEDEC assigned Manufacturer ID and the specific Device
ID.
The command is initiated by driving the CS# pin low and shifting the command code “90H” followed
by a 24-bit address (A23-A0) of 000000H. After which, the Manufacturer ID and the Device ID are
shifted out on the falling edge of SCLK with most significant bit (MSB) first as shown in Figure22. If
the 24-bit address is initially set to 000001H, the Device ID will be read first.
Figure 22. Read Manufacture ID/ Device ID Sequence Diagram
Read Identification (RDID) (9FH)
The Read Identification (RDID) command allows the 8-bit manufacturer identification to be read,
followed by two bytes of device identification. The device identification indicates the memory type in
the first byte, and the memory capacity of the device in the second byte. Any Read Identification
(RDID) command while an Erase or Program cycle is in progress, is not decoded, and has no effect
on the cycle that is in progress. The Read Identification (RDID) command should not be issued while
the device is in Deep Power-Down Mode.
The device is first selected by driving CS# to low. Then, the 8-bit command code for the command is
shifted in. This is followed by the 24-bit device identification, stored in the memory, being shifted out
on Serial Data Output, each bit being shifted out during the falling edge of Serial Clock. The command
sequence is shown in Figure23. The Read Identification (RDID) command is terminated by driving
CS# to high at any time during data output. When CS# is driven high, the device is put in the Standby
Mode. Once in the Standby Mode, the device waits to be selected, so that it can receive, decode and
execute commands.
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