Cypress Semiconductor FX2LP Informations techniques Page 413

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Chapter 15. Registers Page 15-93
4. the rate at which data is being written in exceeds 96 MB/s for a word-wide data bus or
48 MB/s for a byte-wide data bus.
Bits 7-4 HOPERIOD[3:0]
Defines how many IFCLK cycles to assert not ready (HOCTL) to the external master in order
to allow the synchronization interface to catch up.
Bit 3 HOSTATE
Defines what the state of the HOCTL signal should be in to assert not ready.
Bits 2-0 HOCTL[2:0]
Defines which of the six CTL[5:0] pins will be the HOCTL signal which asserts not ready to the
external master when the synchronization detects a potential overflow coming. It should coin-
cide with the CTL[5:0] pin that is picked as the not ready signal for the (macro-level) endpoint
FIFO overflow protection.
This register defines whether the Master Strobe (see FLOWSTB) causes data to read or written on
either the falling edge, the rising edge, or both (double-edge).
Bit 1 FALLING
0: data is not transferred on the falling edge of Master Strobe
1: data is transferred on the falling edge of Master Strobe
Bit 0 RISING
0: data is not transferred on the rising edge of Master Strobe
1: data is transferred on the rising edge of Master Strobe
To cause data to transfer on both edges of Master Strobe, set both bits to 1
FLOWSTBEDGE E6CC
b7 b6 b5 b4 b3 b2 b1 b0
0 0 0 0 0 0 FALLING RISING
R R R R R R R/W RW
0 0 0 0 0 0 0 1
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