Cypress Semiconductor FX2LP Información técnica Pagina 53

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Chapter 1. Introducing EZ-USB FX2 Page 1-27
Figure 1-17. FX2 FIFOs in “GPIF Master” Mode
External systems that connect to the FX2 FIFOs must provide control circuitry to select FIFOs,
check flags, clock data, etc. FX2 contains a sophisticated control unit (the General Programmable
Interface, or GPIF) which can replace this external logic. In the “GPIF Master” FIFO mode,
(Figure 1-17), the GPIF reads the FIFO flags, controls the FIFO strobes, and presents a user-cus-
tomizable interface to the outside world. The GPIF runs at a very high speed (up to 48 MHz clock
rate) so that it can develop high-resolution control waveforms. It can be clocked from one of two
internal sources (30 or 48 MHz) or from an external clock.
Control (CTL) signals are programmable waveform outputs, and ready (RDY) signals are input
pins that can be tested for conditions that cause the GPIF to pause and resume operation, imple-
FIFO
FD[15:0]
Data
EP8
EP6
EP4
EP2
GPIF
FLAGS
CTL
RDY
6
6
GPIFADR
9
30 MHz
48 MHz
IFCLK
IFCLK
SLRD
8051 RDY
8051 INT
select
SLWR
SLOE
SLRD
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