| Pin Name | Pin Function |
| l/00 ~ l/07 (K9XXG08XXM) l/00 ~ l/Ois (K9K4G16XOM) | DATA INPUTS/OUTPUTS The l/0 pins are used to input command, address and data, and to output data during read operations. The Il 0 pins float to high-z when the chip is deselected or when the outputs are disabled. 1/08 ~ l/015 are used only in X16 0rganization device. Since command input and address input are x8 0per- ation, 1/08 ~ 1/015 are not used to input command & address. 1/08 ~ 1/015 are used only for data input and output. |
| CLE | COMMAND LATCH ENABLE The CLE input controls the activating path for commands sent to the command register. When active high, commands are latched into the command register through the l/0 ports on the rising edge of the WE signal. |
| ALE | ADDRESS LATCH ENABLE The ALE input controls the activating path for address to the internal address registers. Addresses are latched on the rising edge of WE with ALE high. |
| CE /CE1 | CHIP ENABLE The CE / CEl input is the device selection control. When the device is in the Busy state, CE / CEl high is ignored, and the device does not return to standby mode in program or erase operation. Regarding CE / CEl control during read operation, refer to 'Page read' section of Device operation . |
| CE2 | CHIP ENABLE The CE2 input enables the second K9K4GXXUOM |
| RE | READ ENABLE The RE input is the serial data-out control, and when active drives the data onto the l/0 bus. Data is valid tREA after the falling edge of RE which also increments the internal column address counter by one. |
| WE | WRITE ENABLE The WE input controls writes to the l/0 port. Commands, address and data are latched on the rising edge of the WE pulse. |
| WP | WRITE PROTECT The WP pin provides inadvertent write/erase protection during power transitions. The internal high voltage generator is reset when the WP pin is active low. |
| R/B1/ R/B2 | READY/BUSY OUTPUT The R/B / R/B1 0utput indicates the status of the device operation. When low, it indicates that a program, erase or random read operation is in process and returns to high state upon completion. It is an open drain output and does not float to high-z condition when the chip is deselected or when outputs are disabled. |
| PRE | POWER-ON READ ENABLE The PRE controls auto read operation executed during power-on. The power-on auto-read is enabled when PRE pin is tied to Vcc. |
| Vcc | POWER Vcc is the power supply for device. |
| Vss | GROUND |
| NC | NO CONNECTION Lead is not internally connected. |
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