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TMS28F1600 Datasheet(PDF) 11 Page - Texas Instruments |
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TMS28F1600 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 44 page TMS28F1600T, TMS28F1600B 16M-BIT (1M BY 16, 2M BY 8) CONCURRENT OPERATIONS AUTO-SELECT BOOT-BLOCK FLASH MEMORY SMJS836 – JANUARY 1997 11 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 operation The TMS28F1600T/B is capable of performing either single or concurrent operations. Single operation means that the device is performing one operation on one memory bank at a time, or in other words, only one WSM is active. A WSM is considered active even when it is in a suspended state. Therefore, from the user’s point of view, the device behaves as if there is only one WSM that controls both memory banks. Concurrent operations mean that the device is performing two operations on two memory banks simultaneously, or in other words, both WSMs are active. Device operations are selected by entering 8-bit command codes with conventional microprocessor timing into two on-chip CSMs through I/O pins DQ0 – DQ7. When the device is powered up, internal reset circuitry initializes the CSMs to single-operation, read-array mode. In single-operation mode, the device is functionally compatible with the existing 8-Mbit boot-block devices (TMS28F800T/B). Changing the mode of operation requires a command code to be entered into the CSM. Table 3 lists the CSM codes for all modes of operation. To enable the concurrent-operations mode, the user must issue the enable concurrent mode command to the CSM. This command is valid only when the device is not busy performing any operation (that is, WSM is not active). Once the concurrent-operations mode is enabled, both status registers are cleared, both CSMs are reset to the read-array mode, and any commands issued to the CSMs from that point forward must be in accordance with the concurrent-operations command definitions. Command definitions for both single and concurrent-operations modes are listed in Table 4. Note that both command definitions are the same except for four commands: read array, read status register, clear status register, and suspend/resume. In single-operation mode, the addresses are don’t care for those commands. However, in concurrent-operations mode, the user must indicate to the CSMs to which write-state machine/memory bank the command is applicable by supplying the memory bank address. This is the only difference between single and concurrent operations as far as command definitions are concerned. To initiate concurrent operations once the concurrent mode is enabled, the user sequentially issues two commands to the CSMs, one for each memory bank; the issued commands must be in accordance with the concurrent-operations command definitions. Note that while the concurrent mode is enabled, the user does not have to operate the device concurrently; the user can operate the device as in single-operation mode but with the command definitions slightly modified. In addition, the user can access and clear each status register individually in concurrent mode. To exit the concurrent-operations mode and return to the standard flash single-operation mode, the user must issue a disable concurrent mode command to the CSMs. This command is valid only when the device is in concurrent-operations mode and none of the memory banks/WSMs are active. Once concurrent-operations mode is disabled, both status registers are cleared and both CSMs reset to the read-array mode. Alternatively, the user can use the reset/power-down mode to reset the device to single-operation, read-array mode. Since both registers are cleared when concurrent-operations mode is enabled/disabled, it is recommended that the status register be read, if required, before the concurrent mode is enabled/disabled. concurrent operations Since the TMS28F1600T / B has two independent WSMs, two operations can be performed on two memory banks concurrently. However, there are some rules and restrictions that must be adhered to when operating the device concurrently. First, read is an operation that cannot be performed concurrently with another read. Second, if read is to be a part of a concurrent operation, then read must be the last command issued to the CSM. Third, once a read command is issued, the CSM does not accept any other command until the read operation is complete. Read array, read algorithm-selection, read status register and clear status register commands are considered to be the same (that is, a read operation) as far as concurrent operations are concerned. |
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