Cypress Semiconductor FX2LP Información técnica Pagina 344

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EZ-USB FX2 Technical Reference Manual
Page 15-24 EZ-USB FX2 Technical Reference Manual v2.1
15.5.9 Chip Revision Control
Figure 15-18. Chip Revision Control
DYN_OUT and ENH_PKT default to 0 on POR.
Cypress highly recommends setting both bits to 1.
Bit 1 DYN_OUT Disable Auto-Arming at the 0-1 transition of AUTOOUT
When DYN_OUT=0, the core automatically arms the endpoints when AUTOOUT is switched
from 0 to 1. This means that firmware must reset the endpoint (and risk losing endpoint data)
when switching between Auto-Out mode and Manual-Out mode.
When DYN_OUT=1, the core disables auto-arming of the endpoints when AUTOOUT transi-
tions from 0 to 1. This feature allows CPU intervention when switching between AUTO and
Manual mode without having to reset the endpoint.
Note: When DYN_OUT=1 and AUTOOUT=1, the CPU is responsible for priming the
pump by initially arming the endpoints (OUTPKTEND w/SKIP=1 to pass packets to host).
Bit 0 ENH_PKT Enhanced Packet Handling
When ENH_PKT=0,
the CPU can neither source OUT packets nor skip IN packets;
it has only
the following capabilities:
OUT packets: Skip or Commit
IN packets: Commit or Edit/Source
When ENH_PKT=1, the CPU has additional capabilities:
OUT packets: Skip, Commit, or Edit/Source
IN packets: Skip, Commit, or Edit/Source
REVCTL
See Section 15.14
Chip Revision Control E60B
b7 b6 b5 b4 b3 b2 b1 b0
0 0 0 0 0 0 DYN_OUT ENH_PKT
R R R R R R R/W R/W
0 0 0 0 0 0 0 0
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