M58MR032C datasheet(20/52 Pages) STMICROELECTRONICS

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M58MR032C, M58MR032D

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Power-down configuration (CR10). The RP pin

may be configured to give very low power con-

sumption when driven low (power-down state). In

power-down the ICC supply current is reduced to a

typical figure of ICC2; if this function is disabled

(default at power-up) the RP pin causes only a re-

set of the device and the supply current is the

stand-by value. The recovery time after a RP pulse

is significantly longer when power-down is en-

abled (see Table 31).

Wait configuration (CR8). In burst mode WAIT

indicates whether the data on the output bus are

valid or a wait state must be inserted. The config-

uration bit determines if WAIT will be asserted one

clock cycle before the wait state or during the wait

state (see Figure 7). WAIT is asserted during a

continuous burst and also during a 4 or 8 burst

length if no-wrap configuration is selected.

Burst order configuration (CR7) and Burst

Wrap configuration (CR3). See Table 16 for

burst order and length.

Clock configuration (CR6). In burst mode deter-

mines if address is latched and data is output on

the rising or falling edge of the clock.

Burst length (CR2-CR0). In burst mode deter-

mines the number of words output by the memory.

It is possible to have 4 words, 8 words or a contin-

uous burst mode, in which all the words are read

sequentially. In continuous burst mode the burst

sequence can cross the end of each of the two

banks (all banks in read array mode). In continu-

ous burst mode or in 4, 8 words no-wrap it may

happen that the memory will stop the data output

flow for a few clock cycles; this event is signaled by

WAIT going low until the output flow is resumed.

The initial address determines if the output delay

will occur as well as its duration. If the starting ad-

dress is aligned to a four words boundary no wait

states will be needed. If the starting address is

shifted by 1,2 or 3 positions from the four word

boundary, WAIT will be asserted for 1, 2 or 3 clock

cycles when the burst sequence is crossing the

first 64 word boundary. WAIT will be asserted only

once during a continuous burst access. See also

Table 16.

Figure 6. X-Latency Configuration Sequence

AI90024

A20-A16

VALID ADDRESS

ADQ15-ADQ0

VALID ADDRESS

VALID DATA

ADQ15-ADQ0

VALID ADDRESS

VALID DATA

ADQ15-ADQ0

VALID ADDRESS

VALID DATA

CONFIGURATION CODE 4

CONFIGURATION CODE 3

CONF. CODE 2

VALID DATA

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