M7020R datasheet(26/150 Pages) STMICROELECTRONICS

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M7020R

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The Read Burst Address Register (RBURREG)

These READ burst address register fields must be

programmed before burst READ (see Table 12).

The Write Burst Address Register (WBURREG)

These WRITE burst address register fields must

be programmed before burst WRITE (see Table

13).

The NFA Register

Bit [0] of each 68-bit data entry is a special bit des-

ignated for use in the operation of the LEARN

command. In 68-bit quadrants, the bit[0] indicates

whether a location is full (bit set to ’1’) or empty (bit

set to ’0’). Every WRITE/LEARN command loads

the address of first 68-bit location that contains a

'0' in the entry’s bit[0]. This is stored in the NFA

set to '1,' the M7020R asserts FULO[1:0] to '1.'

In 136-bit-configured quadrants, the LSB of this

set bit '0' and Bit 68in a 136-bit word to either '0' or

'1' to indicate full/empty status.

Note: Both bits (0 and 68) must be set to '0' or '1'

(e.g., '10' or '01' settings are invalid).

Table 12. Read Burst Register Description

Table 13. Write Burst Register Description

Table 14. NFA Register

Field

Range

Initial Value

Description

ADR

[14:0]

Address. This is the starting address of the data array or mask array

during a burst READ operation. It automatically increments by 1 for

each successive read of the data array or mask array. Once the

operation is complete, the contents of this field must be reinitialized for

the next operation.

[18:15]

Reserved.

BLEN

[27:19]

Length of Burst Access. The device is capable of writing from 4 up

to 511 locations in a single burst. The BLEN decrements

automatically. Once the operation is complete, the contents of this

field must be reinitialized for the next operation.

[67:28]

Reserved.

Field

Range

Initial Value

Description

ADR

[14:0]

Address. This is the starting address of the data array or mask array

during a burst WRITE operation. It automatically increments by 1 for

each successive write of the data array or mask array. Once the

operation is complete, the contents of this field must be reinitialized for

the next operation.

[18:15]

Reserved.

BLEN

[27:19]

Length of Burst Access. The device is capable of writing from 4 up

to 511 locations in a single burst. The BLEN decrements

automatically. Once the operation is complete, the contents of this field

must be reinitialized for the next operation.

[67:28]

Reserved.

Address

67 - 15

14 - 0

Reserved

Index

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