34C60 datasheet(13/58 Pages) SMSC

13 / 58 page

SMSC DS – PPC34C60

Page 13

Rev. 06/01/2001

ADVANCED INFORMATION

3 DAISY CHAIN COMMAND PROTOCOL

The daisy chain protocol is used to select the mode of each device and to allow connection of up to eight devices on one

parallel port. The daisy chain commands use the Multiport Access Protocol (MAP) to access the devices.

The format

of the MAP packets is as follows:

The command byte in the MAP packet represents a code and possibly an address as well. The currently defined codes

are:

(00-07)

(08-0F)

(10-17)

(20-27)

(30)

(40)

(48)

(50-57)

(58-5F)

(D0-D7)

(E0-E7)

0000 0aaa

0000 1aaa

0001 0aaa

0010 0aaa

0011 xxxx

0100 0xxx

0100 1xxx

0101 0aaa

0101 1aaa

1101 0aaa

1110 0aaa

Assign address aaa to the current device

Query Interrupt from device aaa

Query Product ID from device aaa

Select device aaa in EPP mode

De-select all devices

Disable Daisy Chain Interrupts

Enable Daisy Chain Interrupts

Clear Interrupt Latches on device aaa

Set Interrupt Latch on device aaa

Select device aaa in ECP mode

Select device aaa in Compatible Mode - SPP

aaa = Device Address

xxx = Undefined - set to zero

Refer to the Daisy Chain Specification (Reference 3) for more information.

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