tmp19a44fda TOSHIBA Semiconductor CORPORATION, tmp19a44fda Datasheet - Page 621

• Manufacturer Part Number: tmp19a44fda
• Description: 32bit Tx System Risc
• Manufacturer: TOSHIBA Semiconductor CORPORATION

TMP19A44
10) ID-Read
Using the ID-Read command, you can obtain the type and other information on the flash memory
contained in the device. The data to be loaded will be different depending on the address [15:14] of
the fourth and subsequent bus write cycles (any input data other than 0xF can be used). On and
after the fourth bus write cycle, when an LW command (to read an arbitrary flash memory area) is
executed after an SW command, the ID value will be loaded (execute a SYNC command
immediately after the LW command). Once the fourth bus write cycle of an ID-Read command has
passed, the device will not automatically return to the read mode. In this condition, the set of the
fourth bus write cycle and LW/SYNC commands can be repetitively executed. For returning to the
read mode, reset the system or use the Read or Read/reset command.
(Important) The "interval between bus write cycles" between successive command sequences
must be 15 system clock cycles or longer irrespective of the operating frequency used. This device
doesn't have any function to automatically adjust the interval between bus write cycles regarding
execution of multiple SW commands to the flash memory. Therefore, if an inadequate interval is
used between two sets of bus write cycles, the flash memory cannot be written as expected. Prior to
setting the device to work in the onboard programming mode, adjust the bus write cycle interval
using a software timer, etc., to verify that the ID-Read command can be successfully executed at
the operating frequency of the application program. In the onboard programming mode, use the bus
write cycle interval at which the ID-Read command can be operated normally to execute command
sequences to rewrite the flash memory.
Flash Memory Operation
TMP19A44 (rev1.3)24-36
2010-04-01