M7020R datasheet(29/150 Pages) STMICROELECTRONICS

29 / 150 page

29/150

M7020R

COMMAND CODES AND PARAMETERS

A master device, such as an ASIC controller, is-

sues commands to the M7020R using the Com-

mand Valid CMDV signal and the CMD Bus. The

following subsections describe the functions of the

commands.

Command Codes

The M7020R implements four basic commands

shown in Table 16. The Command Code must be

presented to CMD[1:0] while keeping the com-

mand valid (CMDV) signal high for two CLK2X cy-

cles. These two CLK2X cycles are designated as

“Cycle A” and “Cycle B.” The controller ASIC must

align the instructions with the PHS_L signal. The

CMD[8:2] field passes the parameters of the com-

mand in Cycles A and B.

Commands and Command Parameters

Table 17, page 29 lists the CMD bus fields that

contain the M7020R command parameters as well

as their respective cycles.

Table 16. Command Codes

Table 17. Command Parameters

Note: 1. The 272-bit-configured devices or 272-bit-configured quadrants within devices do not support the LEARN Instruction.

CMD Code

Command

Description

READ

Reads one of the following: data array, mask array, device registers, or external

SRAM.

WRITE

Writes one of the following: data array, mask array, device registers, or external

SRAM.

Searches the data array for a desired pattern using the specified register from the

global mask register array and local mask associated with each data cell.

LEARN

The device has internal storage for up to 16 comparands that it can learn. The

device controller can insert these entries at the next free address (as specified by

the NFA register) using the LEARN Instruction.

Cmd

Cyc

READ

SADR[21]

SADR[20]

0 = Single

1 = Burst

0 = Single

1 = Burst

WRITE

SADR[21]

SADR[20]

Global Mask

0 = Single

1 = Burst

Global Mask

0 = Single

1 = Burst

SADR[21]

SADR[20]

SADR[19]

Global Mask

68-bit or 136-bit: 0

272-bit:

1 in 1st Cycle

0 in 2nd Cycle

Successful Search Register Index[2:0]

Comparand Register Index

LEARN(1)

SADR[21]

SADR[20]

Comparand Register Index

Mode

0: 68-bit

1: 136-bit

Comparand Register Index

M7020R датащи(PDF) 29 Page - STMicroelectronics

M7020R датащи(HTML) 29 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

датащи скачать

ссылки URL