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SST38VF6401B-70-5I-TV 데이터시트(PDF) 11 Page - Microchip Technology |
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SST38VF6401B-70-5I-TV 데이터시트(HTML) 11 Page - Microchip Technology |
11 / 58 page 2013 Microchip Technology Inc. Preliminary DS25002B-page 11 SST38VF6401B / SST38VF6402B / SST38VF6403B / SST38VF6404B 4.8.3 DQ1 If an operation aborts during a Write-to-Buffer or Pro- gram Buffer-to-Flash operation, DQ1 is set to ‘1’. To reset DQ1 to ‘0’, issue the Write-to-Buffer Abort Reset command to exit the abort state. A power-off/power-on cycle or a Hardware Reset (RST# = 0) will also clear DQ1. 4.8.4 RY/BY# The RY/BY# pin can be used to determine the status of a Program or Erase operation. The RY/BY# pin is valid after the rising edge of the final WE# pulse in the com- mand sequence. If RY/BY# = 0, then the device is actively programming or erasing. If RY/BY# = 1, the device is in Read mode. The RY/BY# pin is an open drain output pin. This means several RY/BY# can be tied together with a pull-up resistor to VDD.. 4.9 Data Protection The SST38VF6401B/6402B/6403B/6404B provide both hardware and software features to protect nonvolatile data from inadvertent writes. 4.9.1 HARDWARE DATA PROTECTION 4.9.1.1 Noise/Glitch Protection A WE# or CE# pulse of less than 5 ns will not initiate a write cycle. 4.9.1.2 VDD Power Up/Down Detection The Write operation is inhibited when VDD is less than 1.5V. 4.9.1.3 Write Inhibit Mode Forcing OE# low, CE# high, or WE# high will inhibit the Write operation. This prevents inadvertent writes dur- ing power-up or power-down. 4.9.2 HARDWARE BLOCK PROTECTION The SST38VF6402B and SST38VF6404B devices support top hardware block protection, which protects the top boot block of the device. For SST38VF6402B, the boot block consists of the top 32 KWord block, and for SST38VF6404B the boot block consists of the top two 4 KWord blocks (8 KWord total). The SST38VF6401B and SST38VF6403B devices support bottom hardware block protection, which pro- tects the bottom boot block of the device. For SST38VF6401B, the boot block consists of the bottom 32 KWord block, and for SST38VF6403B the Boot Block consists of the bottom two 4 KWord blocks (8 KWord total). The boot block addresses are described in Table 4-2. TABLE 4-1: WRITE OPERATION STATUS Status DQ7 1 DQ6 DQ2 1 DQ1 RY/BY#2 Normal Operation Standard Program DQ7# Toggle No Toggle 0 0 Standard Erase 0 Toggle Toggle N/A 0 Erase-Suspend Mode Read from Erase-Suspended Block 1 No toggle Toggle N/A 1 Read from Non- Erase-Suspended Block Data Data Data Data 1 Program DQ7# Toggle N/A N/A 0 Program Buffer- to-Flash Busy DQ7# 3 Toggle N/A 0 0 Abort DQ7# 3 Toggle N/A 1 0 1. DQ7 and DQ2 require a valid address when reading status information. 2. RY/BY# is an open drain pin. RY/BY# is high in Read mode, and Read in Erase-Suspend mode. 3. During a Program Buffer-to-Flash operation, the datum on the DQ7 pin is the complement of DQ7 of the last word loaded in the Write-Buffer using the Write-to-Buffer command. |
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