Nxp Semiconductors UM10237 ユーザーズマニュアル
UM10237_2
© NXP B.V. 2008. All rights reserved.
User manual
Rev. 02 — 19 December 2008
352 of 792
NXP Semiconductors
UM10237
Chapter 13: LPC24XX USB device controller
9.7.2 USB Command Data register (USBCmdData - 0xFFE0 C214)
This register contains the data retrieved after executing a SIE command. When the data is
ready to be read, the CD_FULL bit of the USBDevIntSt register is set. See
ready to be read, the CD_FULL bit of the USBDevIntSt register is set. See
for details. USBCmdData is a read only register.
9.8 DMA registers
The registers in this group are used for the DMA mode of operation (see
)
9.8.1 USB DMA Request Status register (USBDMARSt - 0xFFE0 C250)
A bit in this register associated with a non-isochronous endpoint is set by hardware when
an endpoint interrupt occurs (see the description of USBEpIntSt) and the corresponding
bit in USBEpIntEn is 0. A bit associated with an isochronous endpoint is set when the
corresponding bit in USBEpIntEn is 0 and a FRAME interrupt occurs. A set bit serves as
a flag for the DMA engine to start the data transfer if the DMA is enabled for the
corresponding endpoint in the USBEpDMASt register. The DMA cannot be enabled for
control endpoints (EP0 and EP1). USBDMARSt is a read only register.
an endpoint interrupt occurs (see the description of USBEpIntSt) and the corresponding
bit in USBEpIntEn is 0. A bit associated with an isochronous endpoint is set when the
corresponding bit in USBEpIntEn is 0 and a FRAME interrupt occurs. A set bit serves as
a flag for the DMA engine to start the data transfer if the DMA is enabled for the
corresponding endpoint in the USBEpDMASt register. The DMA cannot be enabled for
control endpoints (EP0 and EP1). USBDMARSt is a read only register.
Table 326. USB Command Code register (USBCmdCode - address 0xFFE0 C210) bit description
Bit
Symbol
Value
Description
Reset value
7:0
-
-
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
bits. The value read from a reserved bit is not defined.
NA
15:8
CMD_PHASE
The command phase:
0x00
0x01
Read
0x02
Write
0x05
Command
23:16
CMD_CODE/
CMD_WDATA
CMD_WDATA
This is a multi-purpose field. When CMD_PHASE is
Command or Read, this field contains the code for the
command (CMD_CODE). When CMD_PHASE is Write,
this field contains the command write data (CMD_WDATA).
Command or Read, this field contains the code for the
command (CMD_CODE). When CMD_PHASE is Write,
this field contains the command write data (CMD_WDATA).
0x00
31:24
-
-
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
bits. The value read from a reserved bit is not defined.
NA
Table 327. USB Command Data register (USBCmdData - address 0xFFE0 C214) bit
description
Bit
Symbol
Description
Reset value
7:0
CMD_RDATA
Command Read Data.
0x00
31:8
-
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
bits. The value read from a reserved bit is not defined.
NA
Table 328. USB DMA Request Status register (USBDMARSt - address 0xFFE0 C250) bit allocation
Reset value: 0x0000 0000
Bit
31
30
29
28
27
26
25
24
Symbol
EP31
EP30
EP29
EP28
EP27
EP26
EP25
EP24
Bit
23
22
21
20
19
18
17
16
Symbol
EP23
EP22
EP21
EP20
EP19
EP18
EP17
EP16