With One Communication Device Connected - Epson S2R72V18 Technical Manual

1.4.1.4.2

With One Communication Device Connected

Fig. 1-22 shows a typical channel usage arrangement with a USB Communication Device
Class communication device (e.g., wireless LAN adapter) connected. Devices supporting this
class use control, bulk IN, bulk OUT, and interrupt IN transfers.
CH0 is used for control transfers.
General channels (e.g., CHb and CHc) are assigned individually for respective transfers,
since bulk IN and bulk OUT transfers are performed in parallel for this class.
A general channel (e.g., CHd) is also assigned individually for interrupt IN transfers in the
same way.
The hardware executes transactions by scheduling transfers to and from the channels (refer to
"1.4.2 Scheduling").
Fig. 1-22 Channel usage example (with one communication device connected)
S2R72V18 Technical Manual (Rev.1.00)
Host
F/W
IRP
CD1
Ctl
CD1
BulkIn
CD1
BulkOut
CD1
IntIn
EPSON
Host Controller
(Channel Resister)
H/W
CH0
(for Ctl only)
CHa
(for Bulk 1)
CHb
(for Bulk/Int/Iso 1)
CHc
(for Bulk/Int/Iso 2)
CHd
(for Bulk/Int/Iso 3)
CHe
(for Bulk/Int/Iso 4)
1. Functions
Device
CD1
Ctl
BulkIn
Bulkout
IntIn
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