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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
732 of 1441
NXP Semiconductors
UM10503
Chapter 26: LPC43xx/LPC43Sxx USB1 Host/Device controller
26.6.2 USB Command register (USBCMD)
The host/device controller executes the command indicated in this register.
Table 527. HCCPARAMS register (HCCPARAMS - address 0x4000 7108) bit description
Bit
Symbol
Description
Reset value Access
0
ADC
64-bit Addressing Capability. If zero, no 64-bit
addressing capability is supported.
0
RO
1
PFL
Programmable Frame List Flag. If set to one, then
the system software can specify and use a smaller
frame list and configure the host controller via the
USBCMD register Frame List Size field. The frame
list must always be aligned on a 4K-boundary. This
requirement ensures that the frame list is always
physically contiguous.
1
RO
2
ASP
Asynchronous Schedule Park Capability. If this bit is
set to a one, then the host controller supports the
park feature for high-speed queue heads in the
Asynchronous Schedule.The feature can be
disabled or enabled and set to a specific level by
using the Asynchronous Schedule Park Mode
Enable and Asynchronous Schedule Park Mode
Count fields in the USBCMD register.
1
RO
7:4
IST
Isochronous Scheduling Threshold. This field
indicates, relative to the current position of the
executing host controller, where software can
reliably update the isochronous schedule.
0
RO
15:8
EECP
EHCI Extended Capabilities Pointer. This optional
field indicates the existence of a capabilities list.
0
RO
31:16
-
These bits are reserved and should be set to zero.
-
-
Table 528. DCIVERSION register (DCIVERSION - address 0x4000 7120) bit description
Bit
Symbol
Description
Reset value Access
15:0
DCIVERSION The device controller interface conforms to the
two-byte BCD encoding of the interface version
number contained in this register.
0x1
RO
31:16
-
These bits are reserved and should be set to
zero.
-
-
Table 529. DCCPARAMS (address 0x4000 7124)
Bit
Symbol
Description
Reset value Access
4:0
DEN
Device Endpoint Number.
0x4
RO
6:5
-
These bits are reserved and should be set to zero.
-
-
7
DC
Device Capable.
0x1
RO
8
HC
Host Capable.
0x1
RO
31:9
-
These bits are reserved and should be set to zero.
-
-