M65KG512AB8W9 datasheet(10/54 Pages) STMICROELECTRONICS

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Signal descriptions

M65KG526AB

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2.6

Row Address Strobe (RAS)

The Row Address Strobe, RAS, is used in conjunction with Address Inputs A0-A12 and

BA1-BA0, to select the starting address location prior to a Read or Write.

2.7

Write Enable (W)

The Write Enable input, W, controls writing.

2.8

Clock Inputs (K, K)

The Clock signals, K and K, are the master clock inputs. All input signals except

UDQM/LDQM, UDQS/LDQS and DQ0-DQ15 are referred to the cross point of K rising edge

and K falling edge. During read operations, UDQS/LDQS and DQ0-DQ15 are referred to the

cross point of K rising edge and K falling edge. During write operations, UDQM/LDQM and

DQ0-DQ15 are referred to the cross point of UDQS/LDQS and VREF, and UDQS/LDQS to

the cross point of K rising edge and K falling edge.

2.9

Clock Enable (KE)

When driven Low, VIL, the Clock Enable input, KE, is used to suspend the Clock K, to switch

the device to Self Refresh, Power-Down or Deep Power-Down mode.

The Clock Enable, KE, must be stable for at least one clock cycle. This means that, if KE

level changes on K rising edge and K falling edge with a setup time of tAS, it must be at the

same level by the next K rising edge with a hold time of tAH.

2.10

Lower/Upper Data Input Mask (LDQM, UDQM)

Lower Data Input Mask and Upper Data Input Mask are input signals used to mask the data

input during write operations. UDQM and LDQM are sampled when UDQS/LDQS level

crosses VREF. When LDQM is Low, VIL, DQ0 to DQ7 inputs are selected. When UDQM is

Low, VIL, DQ8 to DQ15 inputs are selected.

2.11

Lower/Upper Data Read/Write Strobe Input/Output (LDQS,

UDQS)

LDQS and UDQS act as write data strobe (as input) and read data strobe (as output)

respectively. LDQS and UDQS are the strobe signals for DQ0 to DQ7 and DQ8 to DQ15,

respectively. During read operations, the device outputs the data strobe through

LDQS/UDQS pins simultaneously with data (see Figure 10). Data is output at both the rising

and falling edge of the data strobe.

During write operations, LDQS/UDQS should be input as the strobe for the input data

together with LDQM/UDQM (see Figure 18). The inputs data should be synchronized with

the high and low pulse of LDQS/UDQS.

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