Universal Serial Bus
M30240 Group
Rev.1.00 Sep 24, 2003 Page 53 of 360
1.2.18.4.9 USB DMAx Request Registers
The USB DMAx Request Registers, shown in Figure 1.41 and Figure 1.42, are used to select which USB End-
point x FIFO read/write requests are selected as the DMAC channel 0 or channel 1 request source. The USB
DMA0 (DMA1) Request Register should have only one bit set at any given time. When multiple bits are set,
no request is selected.
Figure 1.41: USB DMA0 Request Register
Figure 1.42: USB DMA1 Request Register
1.2.18.4.10 USB Endpoint Enable Register
The USB Endpoint Enable Register, shown in Figure 1.43, is used to enable/disable an individual endpoint.
Endpoint 0 is always enabled and cannot be disabled by firmware. All endpoints are enabled after reset.
Figure 1.43: USB Endpoint Enable Register
USB DMA0 Request Register
Symbol Address When reset
USBSAR0 0309
16
00
16
Bit nameBit symbol
b7 b6 b5 b4 b3 b2 b1 b0
Function
W
R
DMA0R0
DMA0R1
DMA0R2
DMA0R3
DMA0R4
DMA0R5
DMA0R6
DMA0R7
Endpoint 1 IN FIFO write request selection bit
Endpoint 2 IN FIFO write request selection bit
Endpoint 3 IN FIFO write request selection bit
Endpoint 4 IN FIFO write request selection bit
Endpoint 1 OUT FIFO read request selection bit
Endpoint 2 OUT FIFO read request selection bit
Endpoint 3 OUT FIFO read request selection bit
Endpoint 4 OUT FIFO read request selection bit
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 : Not selected
1 :
Selected
USB DMA1 Request Register
Symbol Address When reset
USBSAR1 030A
16
00
16
Bit nameBit symbol
b7 b6 b5 b4 b3 b2 b1 b0
Function
W
R
DMA1R0
DMA1R1
DMA1R2
DMA1R3
DMA1R4
DMA1R5
DMA1R6
DMA1R7
Endpoint 1 IN FIFO write request selection bit
Endpoint 2 IN FIFO write request selection bit
Endpoint 3 IN FIFO write request selection bit
Endpoint 4 IN FIFO write request selection bit
Endpoint 1 OUT FIFO read request selection bit
Endpoint 2 OUT FIFO read request selection bit
Endpoint 3 OUT FIFO read request selection bit
Endpoint 4 OUT FIFO read request selection bit
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 : Not selected
1 :
Selected
USB Endpoint Enable Register
Symbol Address When reset
USBEPEN 030B
16 FF16
Bit nameBit symbol
b7 b6 b5 b4 b3 b2 b1 b0
Function
W
R
EP1_OUT
EP1_IN
EP2_OUT
EP2_IN
EP3_OUT
EP3_IN
EP4_OUT
EP4_IN
Endpoint 1OUT FIFO Enable bit
Endpoint 1 IN FIFO Enable bit
Endpoint 2OUT FIFO Enable bit
Endpoint 2 IN FIFO Enable bit
Endpoint 3 OUT FIFO Enable bit
Endpoint 3 IN FIFO Enable bit
Endpoint 4 OUT FIFO Enable bit
Endpoint 4 IN FIFO Enable bit
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 : Disabled
1 :
Enabled
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