Cypress Semiconductor FX2LP Información técnica Pagina 412

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EZ-USB FX2 Technical Reference Manual
Page 15-92 EZ-USB FX2 Technical Reference Manual v2.1
1: GPIF is the slave of the bus transaction. This means that one of the RDY[5:0] pins will be
the Master Strobe and the particular one is selected by MSTB[2:0].
Bit 6 RDYASYNC
If SLAVE is 0 then this bit is ignored, otherwise:
0: Master Strobe (which is a RDY pin in this case) is asynchronous to IFCLK.
1: Master Strobe (which is a RDY pin in this case) is synchronous to IFCLK.
Bit 5 CTLTOGL
If SLAVE is 1 then this bit is ignored. Otherwise, this bit defines which state of the flow logic
(see FLOWLOGIC) causes Master Strobe (which will be a CTL pin in this case) to toggle. For
example, if this bit is set to 1, then if the output of the flow logic equals 1 then Master Strobe
will toggle causing data to flow on the bus. If in the same example the output of the flow logic
equals 0 then Master Strobe will freeze causing data flow to halt on the bus.
Bit 4 SUSTAIN
If SLAVE is 1 then this bit is ignored.
Upon exiting a flow state in which SLAVE is 0, Master Strobe (which is a CTL pin in this case) will
normally go back to adhering to the CTL opcodes defined in the waveform descriptor.
Bit 2-0 MSTB[2:0]
If SLAVE is 0 then these bits will select which CTL[5:0] pin is the Master Strobe. If SLAVE is 1
then these bits will select which RDY[5:0] pin is the Master Strobe.
For flow state transactions that meet the following criteria:
1. The interface is asynchronous.
2. GPIF is acting like a slave (FLOWSTB.SLAVE = 1), and thus Master Strobe is a RDY
pin.
3. data is being written into the GPIF.
FLOWHOLDOFF E6CA
b7 b6 b5 b4 b3 b2 b1 b0
HOPERIOD[3:0] HOSTATE HOCTL[2:0]
RW RW RW RW RW RW RW RW
0 0 0 1 0 0 1 0
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