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HY29LV320BF-80 Datasheet(PDF) 11 Page - Hynix Semiconductor |
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HY29LV320BF-80 Datasheet(HTML) 11 Page - Hynix Semiconductor |
11 / 44 page 11 r1.3/May 02 HY29LV320 WE# ADR CE# OE# DATA OUT t ACC t CE t OE Figure 1. Read Operation Figure 2. Write Operation OE# ADR CE# WE# DATA IN t AS t AH t DH t DS WE# ADR CE# OE# DATA OUT t ACC t CE t OE Figure 1. Read Operation Figure 2. Write Operation OE# ADR CE# WE# DATA IN t AS t AH t DH t DS Write Operation Certain operations, including programming data and erasing sectors of memory, require the host to write a command or command sequence to the HY29LV320. Writes to the device are performed by placing the word address on the device’s ad- dress inputs while the data to be written is input on DQ[15:0]. The host system must drive the CE# and WE# pins Low and drive OE# High for a valid write operation to take place. All addresses are latched on the falling edge of WE# or CE#, which- ever happens later. All data is latched on the ris- ing edge of WE# or CE#, whichever happens first. See Figure 2. .The “Device Commands” section of this specifi- cation provides details on the specific device com- mands implemented in the HY29LV320. Accelerated Program Operation This device offers accelerated program operations through the “Accelerate” function provided by the WP#/ACC pin. This function is intended primarily for faster programming throughput at the factory. If V HH is applied to the WP#/ACC input, the device enters the Unlock Bypass mode, temporarily unprotects any protected sectors, and uses the higher voltage on the pin to reduce the time re- quired for program operations. The system would then use the two-cycle program command se- quence as required by the Unlock Bypass mode. Removing V HH from the pin returns the device to normal operation. Note: WP# sector protection cannot be used while WP#/ ACC = V HH. Thus, all sectors are unprotected and can be erased and programmed while in Accelerated Pro- gramming mode. Note: The Accelerate function does not affect the time required for Erase operations. See the description of the WP#/ACC pin in the Pin Descriptions table for additional information on this function. Write Protect Function The Write Protect function provides a hardware method of protecting the boot sectors without us- ing V ID. This function is a second function pro- vided by the WP#/ACC pin. Placing this pin at V IL disables program and erase operations in the bottom or top 32K words of the array (the boot sectors). The affected sectors are as follows (see Tables 1 and 2): n HY29LV320B: S0 – S3 n HY29LV320T: S63 – S66 If the pin is placed at V IH, the protection state of those sectors reverts to whether they were last set to be protected or unprotected using the method described in the Sector Group Protection and Unprotection sections. Note: Sectors protected by WP#/ACC = V IL remain pro- tected during Temporary Sector Unprotect and cannot be erased or programmed. Also see note under Accel- erate Program Operation above. Standby Operation When the system is not reading or writing to the device, it can place the device in the Standby |
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