PDP83TG720SWCSTQ1 datasheet(43/199 Pages) TI

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Table 7-14. MMD Register Space Division

MMD Register Space

MMD1F

0x000 - 0x0EFD

MMD1

0x1000 - 0x1904

MMD3

0x3000 - 0x390D

MMD7

0x7000 - 0x7200

Note

For MMD1/3/7, most significant nibble of the register address is used to denote the respective

MMD space. This should be ignored during actual register access operation. For example to

access register 0x1904 use 0x0904 as the register address and x01 as the MMD.

All accesses through register REGCR and ADDAR must use the correct DEVAD. Transactions with other

DEVADs are ignored. REGCR[15:14] holds the access function: address (00), data with no post increment (01),

data with post increment on read and writes (10) and data with post increment on writes only (11).

• ADDAR is the address and data MMD register. ADDAR is used in conjunction with REGCR to provide the

access to the extended register set. If register REGCR[15:14] is (00), then ADDAR holds the address of the

extended address space register. Otherwise, ADDAR holds the data as indicated by the contents of its

address register. When REGCR[15:14] is set to (00), accesses to register ADDAR modify the extended

registers within the extended register set.

• When REGCR[15:14] is set to (01), accesses to register ADDAR access the register within the extended

• When REGCR[15:14] is set to (10), access to register ADDAR access the register within the extended

writes, the value in the address register is incremented.

• When REGCR[15:14] is set to (11), access to register ADDAR access the register within the extended

the value in the address register is incremented. For read accesses, the value of the address register

remains unchanged.

The following sections describe how to perform operations on the extended register set using register REGCR

and ADDAR.

7.4.12 Write Address Operation

To set the address register:

1. Write the value 0x001F (address function field = 00, DEVAD = '11111') to register REGCR.

2. Write the register address to register ADDAR.

Subsequent writes to register ADDAR (step 2) continue to write the address register.

7.4.12.1 Example - Write Address Operation

For writing register addresses within MMD1 field:

1. Write the value 0x0001 (address function field = 00, DEVAD = '00001') to register REGCR.

2. Write the register address to register ADDAR.

7.4.13 Read Address Operation

To read the address register:

1. Write the value 0x001F (address function field = 00, DEVAD = '11111') to register REGCR.

2. Read the register address from register ADDAR.

Subsequent reads to register ADDAR (step 2) continue to read the address register.

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DP83TG720S-Q1

SNLS604 – SEPTEMBER 2020

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