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TMS28F200EB90CDBJL Datasheet(PDF) 8 Page - Texas Instruments |
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TMS28F200EB90CDBJL Datasheet(HTML) 8 Page - Texas Instruments |
8 / 79 page TMS28F002Axy, TMS28F200Axy 262144 BY 8-BIT/131072 BY 16-BIT AUTO-SELECT BOOT-BLOCK FLASH MEMORIES SMJS826D – JANUARY 1996 – REVISED SEPTEMBER 1997 8 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 parameter block Two parameter blocks of 8K bytes each can be used like a scratch pad to store frequently updated data. Alternatively, the parameter blocks can be used for additional boot-block or main-block data. If a parameter block is used to store additional boot-block data, caution must be exercised because the parameter block does not have the boot-block data-protection safety feature. main block Primary memory on the TMS28F200Axy is located in two main blocks. One of the blocks has storage capacity for 128K bytes and the other block has storage capacity for 96K bytes. data protection Data is secured or unsecured by using different combinations of the reset / deep power-down pin (RP), the write-protect pin (WP), and VPP supply levels. Table 2 shows a listing of these combinations. There are two configurations to secure the entire memory against the inadvertent alteration of data. The VPP supply pin can be held below the VPP lock-out voltage level (VPPLK) or the reset/deep power-down pin (RP) can be pulled to a logic-low level. If RP is held low, the device resets—which means that it powers down, and therefore, cannot be read. Typically this pin is tied to the system reset for additional protection during system power up. The boot-block sector has an additional security feature through the WP pin on the ’ASy, ’AEy, and ’AFy devices. When the RP pin is at a logic-high level, the WP pin controls whether the boot-block sector is protected. When WP is held at the logic-low level, the boot block is protected. When WP is held at the logic-high level, the boot block is unprotected, along with the rest of the other sectors. Alternatively, the entire memory for all voltage configurations can be unprotected by pulling the RP pin to VHH (12 V). Table 2. Data-Protection Combinations DATA-PROTECTION ’ASy, ’AEy, or ’AFy ’AMy or ’AZy PROVIDED VPP RP WP† VPP RP WP† All blocks locked VIL X X VIL X X All blocks locked (reset) X VIL X X VIL X All blocks unlocked > VPPLK VHH VIH X VIH VHH VHH X Only boot block locked > VPPLK VIH VIL VHH VIH X † For TMS28F200AZy and TMS28F200AMy (12-V VPP) products, the WP pin is disabled and can be left floating. To unlock blocks, RP must be at VHH. command-state machine (CSM) Commands are issued to the CSM using standard microprocessor write timings. The CSM acts as an interface between the external microprocessor and the internal write state machine (WSM). The available commands are listed in Table 3 and the descriptions of these commands are listed in Table 4. When a program or erase command is issued to the CSM, the WSM controls the internal sequences and the CSM only responds to status reads. After the WSM completes its task, the write status bit (WSM) (SB7) is set to a logic-high level, allowing the CSM to respond to the full command set again. operation Device operations are selected by entering standard JEDEC 8-bit command codes with conventional microprocessor timing into an on-chip CSM through I/O pins DQ0 – DQ7. When the device is powered up, internal reset circuitry initializes the chip to a read-array mode of operation. Changing the mode of operation requires that a command code be entered into the CSM. Table 3 lists the CSM codes for all modes of operation. |
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