PPC34C60 datasheet(20/58 Pages) SMSC

20 / 58 page

SMSC DS – PPC34C60

Page 20

Rev. 06/01/2001

ADVANCED INFORMATION

OUTPUT CONFIGURATION REGISTER - 0001 (Read/Write)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

SP1

SP0

SO1

SO0

CO3

CO2

CO1

CO0

The Output Configuration Register defines the operation of the bits in the Output Register.

The PPC34C60 has eight independent output lines. The functionality of seven of these output lines is selected through the

Output Configuration Register. All eight output lines are then controlled or activated through the Output Register

(RRRR=0010).

The seven programmable output lines controlled by Output Register bits 0-6 can be selected to operate as either general

purpose output pins (inverting), or as special function output pins. The special functions are: Chip Select, Strobe, and

Auto-Power.

The eighth (non-programmable) output line is controlled by Output Register bit 7. This output line is defined as "Bus Reset",

but it is simply an output bit. It may be used for other purposes if a Bus Reset signal is not required or generated

elsewhere. This bit is present on two pins (95 and 94) in both normal and inverted polarities.

Bits 0-3:

SPECIAL FUNCTIONS FOR PROGRAMMABLE OUTPUT LINES 0-3:

Programmable output lines 0-3 can be individually configured as General Purpose (inverting) outputs or as chip select

outputs. Chip selects are generated by the bus cycle state machine.

During a bus cycle, the chip select goes low at the start of the cycle and remains low until the end of the cycle.

Output line N (N = 0...3) is controlled through Output Register Bit N. Output line N, configured as a General Purpose

output, will present the inverted value written to Output Register bit N. Output line N, configured as a Chip Select, will follow

the bus chip select if Output Register bit N is a 1.

BIT 0:CO0 - CHIP SELECT 0/STANDARD OUTPUT 0

Select Output line 0 (Pin 84) as a General Purpose inverting output.

Select Output line 0 (Pin 84) as a Chip Select output.

BIT 1:CO1 - CHIP SELECT 1/STANDARD OUTPUT 1

Select Output line 1 (Pin 85) as a General Purpose inverting output.

Select Output line 1 (Pin 85) as a Chip Select output.

BIT 2:CO2 - CHIP SELECT 2/STANDARD OUTPUT 2

Select Output line 2 (Pin 86) as a General Purpose inverting output.

Select Output line 2 (Pin 86) as a Chip Select output.

BIT 3:CO3 - CHIP SELECT 3/STANDARD OUTPUT 3

Select Output line 3 (Pin 87) as a General Purpose inverting output.

Select Output line 3 (Pin 87) as a Chip Select output.

Bits 4-7:

SPECIAL FUNCTIONS FOR PROGRAMMABLE OUTPUT LINES 4-6

Programmable Output lines 4-6 can be individually configured as general purpose (inverting) outputs or as strobe outputs.

These strobe signals may be used to clock any edge-triggered flip-flop or register. Additionally, Programmable Output line

6 may be programmed as an Auto-Power pin. This signal allows a peripheral to automatically control its power on state,

so that a separate power switch is not necessary. The external circuitry necessary for this passively pulls down the INIT

line from the host. The power supply is turned on when the INIT line rises to a high logic level. The PPC34C60 will then

monitor the host, and will bring the Auto-Power pin to a logic low level when the power can be shut off.

Output line N, configured as a Strobe signal, is normally high and pulses low momentarily when a 1 is written to Output

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