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CAT25320LI-GT3 데이터시트(PDF) 5 Page - Catalyst Semiconductor |
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CAT25320LI-GT3 데이터시트(HTML) 5 Page - Catalyst Semiconductor |
5 / 16 page CAT25320 © 2007 Catalyst Semiconductor, Inc. 5 Doc. No. 1111 Rev. E Characteristics subject to change without notice STATUS REGISTER The Status Register, as shown in Table 2, contains a number of status and control bits. The RDY ¯¯¯¯ (Ready) bit indicates whether the device is busy with a write operation. This bit is automatically set to 1 during an internal write cycle, and reset to 0 when the device is ready to accept commands. For the host, this bit is read only. The WEL (Write Enable Latch) bit is set/reset by the WREN/WRDI commands. When set to 1, the device is in a Write Enable state and when set to 0, the device is in a Write Disable state. The BP0 and BP1 (Block Protect) bits determine which blocks are currently write protected. They are set by the user with the WRSR command and are non-volatile. The user is allowed to protect a quarter, one half or the entire memory, by setting these bits according to Table 3. The protected blocks then become read-only. The WPEN (Write Protect Enable) bit acts as an enable for the WP ¯¯¯ pin. Hardware write protection is enabled when the WP ¯¯¯ pin is low and the WPEN bit is 1. This condition prevents writing to the status register and to the block protected sections of memory. While hardware write protection is active, only the non-block protected memory can be written. Hardware write protection is disabled when the WP ¯¯¯ pin is high or the WPEN bit is 0. The WPEN bit, WP ¯¯¯ pin and WEL bit combine to either permit or inhibit Write operations, as detailed in Table 4. Table 2. Status Register 7 6 5 4 3 2 1 0 WPEN 0 0 0 BP1 BP0 WEL RDY ¯¯¯¯ Table 3. Block Protection Bits Status Register Bits BP1 BP0 Array Address Protected Protection 0 0 None No Protection 0 1 0C00-0FFF Quarter Array Protection 1 0 0800-0FFF Half Array Protection 1 1 0000 -0FFF Full Array Protection Table 4. Write Protect Conditions WPEN WP ¯¯¯ WEL Protected Blocks Unprotected Blocks Status Register 0 X 0 Protected Protected Protected 0 X 1 Protected Writable Writable 1 Low 0 Protected Protected Protected 1 Low 1 Protected Writable Protected X High 0 Protected Protected Protected X High 1 Protected Writable Writable |
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