Cirrus Logic EP93xx User Manual
Page 463
DS785UM1
11-23
Copyright 2007 Cirrus Logic
Universal Serial Bus Host Controller
EP93xx User’s Guide
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Physical address of the first endpoint descriptor of the bulk list.
Bit Description:
RSVD:
Reserved. Unknown During Read.
AD:
BulkHeadED. HC traverses the Bulk list starting with the
HcBulkHeadED pointer. The content is loaded from HCCA
during the initialization of HC.
HcBulkCurrentED
Address:
0x8002_002C
Default:
0x0000_0000
Definition:
Physical address of the current endpoint descriptor of the bulk list.
Bit Description:
RSVD:
Reserved. Unknown During Read.
AD:
BulkCurrentED. This is advanced to the next ED after the
HC has served the present one. HC continues processing
the list from where it left off in the last Frame. When it
reaches the end of the Bulk list, HC checks the
ControlListFilled of HcControl. If set, it copies the content
of HcBulkHeadED to HcBulkCurrentED and clears the bit.
If it is not set, it does nothing. HCD is only allowed to
modify this register when the BulkListEnable of HcControl
is cleared. When set, the HCD only reads the
instantaneous value of this register. This is initially set to
zero to indicate the end of the Bulk list.
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AD
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AD
RSVD