This Data Sheet may be revised by subsequent versions

©2004 Eon Silicon Solution, Inc., www.essi.com.tw

or modifications due to changes in technical specifications.

20

EN25F80

Rev. D, Issue Date: 2007/05/16

Read Manufacturer / Device ID (90h)

The Read Manufacturer/Device ID instruction is an alternative to the Release from Power-down / Device

ID instruction that provides both the JEDEC assigned manufacturer ID and the specific device ID.

The Read Manufacturer/Device ID instruction is very similar to the Release from Power-down / Device ID

instruction. The instruction is initiated by driving the CS# pin low and shifting the instruction code “90h”

followed by a 24-bit address (A23-A0) of 000000h. After which, the Manufacturer ID for Eon (1Ch) and the

Device ID are shifted out on the falling edge of CLK with most significant bit (MSB) first as shown in

Figure 17. The Device ID values for the EN25F80 are listed in Table 5. If the 24-bit address is initially set

to 000001h the Device ID will be read first

Figure 18. Read Manufacturer / Device ID Diagram

Read Identification (RDID)(9Fh)

The Read Identification (RDID) instruction 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) instruction 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) instruction should not be

issued while the device is in Deep Power down mode.

The device is first selected by driving Chip Select Low. Then, the 8-bit instruction code for the instruction

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 instruction

sequence is shown in Figure 19. The Read Identification (RDID) instruction is terminated by driving Chip

Select High at any time during data output.

When Chip Select is driven High, the device is put in the Standby Power mode. Once in the Standby

Power mode, the device waits to be selected, so that it can receive, decode and execute instructions.