m58bw016db STMicroelectronics, m58bw016db Datasheet - Page 24

• Manufacturer Part Number: m58bw016db
• Description: 16 Mbit 512kb X32, Boot Block, Burst 3v Supply Flash Memories
• Manufacturer: STMicroelectronics

Bus operations
3.3.6
3.3.7
3.3.8
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Valid Clock Edge bit (M6)
The Valid Clock Edge bit, M6, is used to configure the active edge of the Clock, K, during
Synchronous Burst Read operations. When the Valid Clock Edge bit is ’0’ the falling edge of
the Clock is the active edge; when the Valid Clock Edge bit is ’1’ the rising edge of the Clock
is active.
Wrap Burst bit (M3)
The burst reads can be confined inside the 4 or 8 double-word boundary (wrap) or
overcome the boundary (no wrap). The Wrap Burst bit is used to select between wrap and
no wrap. When the Wrap Burst bit is set to ‘0’ the burst read wraps; when it is set to ‘1’ the
burst read does not wrap.
Burst Length bit (M2-M0)
The Burst Length bits set the maximum number of double-words that can be output during a
Synchronous Burst Read operation before the address wraps. Burst lengths of 4 or 8 are
available for both the sequential and interleaved burst types, and a continuous burst is
available for the sequential type.
Table 7: Burst Configuration Register
that the memory accepts;
output from a given starting address for each length.
If either a Continuous or a No Wrap Burst Read has been initiated the device will output data
synchronously. Depending on the starting address, the device activates the Valid Data
Ready output to indicate that a delay is necessary before the data is output. If the starting
address is aligned to an 8 double-word boundary, the Continuous Burst mode will run
without activating the Valid Data Ready output. If the starting address is not aligned to an 8
double-word boundary, Valid Data Ready is activated to indicate that the device needs an
internal delay to read the successive words in the array.
M10, M5 and M4 are reserved for future use.
Table 8: Burst type
M58BW016DT, M58BW016DB, M58BW016FT, M58BW016FB
gives the valid combinations of the Burst Length bits
definition, gives the sequence of addresses