M7040N datasheet(144/159 Pages) STMICROELECTRONICS

144 / 159 page

M7040N

144/159

SRAM WRITE withTable(s) of Upto31 Devices

The following explains the SRAM WRITE opera-

tion done through a table(s) of up to 31 devices

with the following parameters (TLSZ = 10). The di-

agram of such table(s) is shown in Figure 107,

page 145. The following assumes that SRAM ac-

cess is done through M7040N Device 0 – Device

0 is the selected device. Figure 108, page 146 and

Figure 109, page 147 show the timing diagram for

Device 0 and Device 30, respectively.

– Cycle 1A: The host ASIC applies the WRITE In-

struction on CMD[1:0] using CMDV = 1. The DQ

Bus supplies the address with DQ[20:19] set to

'10' to select the SRAM address. The host ASIC

selects the device for which the ID[4:0] matches

the DQ[25:21] lines. The host ASIC also sup-

plies SADR[23:21] on CMD[8:6] in this cycle.

Note: CMD[2] must be set to '0' for SRAM

WRITE because Burst WRITEs into the SRAM

are not supported.

– Cycle 1B: The host ASIC continues to apply the

WRITE InstructiononCMD[1:0] using CMDV =

1. The DQ Bus supplies the address with

DQ[20:19] set to '10' to select the SRAM ad-

dress.

Note: CMD[2] must be set to '0' for SRAM

WRITE because Burst WRITEs into the SRAM

are not supported.

– Cycle 2: The host ASIC continues to drive

DQ[71:0]. The data in this cycle is not used by

the M7040N device.

– Cycle 3: The host ASIC continues to drive

DQ[71:0]. The data in this cycle is not used by

the M7040N device.

At the end of Cycle 3, a new command can begin.

The WRITE is a pipelined operation. The WRITE

Cycle appears at the SRAM Bus, however, with

the same latency as that of a SEARCH Instruction,

as measured from the second cycle of the WRITE

command

M7040N Datasheet(PDF) 144 Page - STMicroelectronics

M7040N Datasheet(HTML) 144 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL