TMC2072 datasheet(21/106 Pages) SMSC

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Peripheral Mode CircLink™ Controller

Datasheet

SMSC TMC2072

Page 21

Revision 0.1 (01-30-06)

DATASHEET

1.5.5

Data Bus Width Selection

(W16: Pin)

This pin selects the bit width of the data bus in Peripheral mode; H: 16-bit mode, L: 8-bit mode. In the 16-

bit mode, the LSB address in the CircLink is fixed to 0.

1.5.6

Data Bus Byte Swap

(nSWAP: Pin)

In Peripheral mode, this pin selects the data order at 8-bit access. CircLink registers are defined as 16-bit

width, but 8-bit access is available and in this case the assignment of lower/upper byte of registers and

odd/even numbers of the address can be changed. nSWAP=L assigns the lower byte to even number

address and the upper byte to odd number address, and nSWAP=H assigns the lower byte to odd number

address and the upper byte to even number address.

1.5.7

Data Strobe Polarity Specification

(nDSINV: pin)

In Peripheral mode, this pin selects the pin polarity of data strobe (nDS). It is active low with nDSINV = H

and active high with nDSINV = L.

1.5.8

Page Size Selection

(PS[1:0]: Pin/Register)

Selects page size per packet. The maximum number of nodes depends on the page size selection since

the packet buffer size is limited to 1 kBytes. There are two methods to specify the page size: either through

pin or register settings depending on INIMODE (bit 9); 0: selects pin, 1: selects register (The default is 0).

1.5.9

MAXID Number Setup

(MAXID[4:0]: Pin/Register)

The maximum node ID is set based on the number of nodes on the network. All nodes in a CircLink

network, therefore, should have the same maximum node ID. This optimizes the time required to

reconfigure the network. There are two methods to specify the maximum node ID, Either through pin or

nDIAG pin is set to L as the exception, however, the maximum node ID is automatically set to the largest

value. For more details, refer to section 2.10 - Diagnostic Mode.

PS[1:0]

Page Size

Max Node Number

256 Byte

3 Node

128 Byte

7 Node

64 Byte

15 Node

32 Byte

31 Node

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