Cypress Semiconductor FX2LP Informações Técnicas descarregar pdf (Página 201)

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Chapter 10. General Programmable Interface (GPIF) Page 10-11

10.3 Programming the GPIF Waveforms

Each GPIF Waveform Descriptor can define up to 7 States. In each State, the GPIF can be pro-

grammed to:

• Drive (high or low) or float the CTL outputs

• Sample or drive the FIFO Data bus

• Increment the value on the GPIF Address bus

• Increment the pointer into the current FIFO

• Trigger a GPIFWF (GPIF Waveform) interrupt

Additionally, each State may either sample any two of the following:

• The RDYx input pins

• A FIFO flag

• The INTRDY (internal RDY) flag

• The Transaction-Count-Expired flag

then AND, OR, or XOR the two terms and branch on the result to any State

or:

• Delay a specified number [1-256] of IFCLK cycles

States which sample and branch are called “Decision Points” (DPs); States which don’t are called

“Non-Decision Points” (NDPs).

Figure 10-6. GPIF State Machine Overview

trig

(up to 7 programmable states)

and

GPIF State Machine

INTRDY bit

GPIFWF ISR

Event

Firmware Hooks

State X

State Y

NDP DP

State 7

IDLE

CPU

where:

(reserved)

CPU GPIF

X = Y-1

LFunc

{

AND,

OR,

XOR

}

Done

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