XR21V1414IM48 EXAR [Exar Corporation], XR21V1414IM48 Datasheet - Page 15

• Manufacturer Part Number: XR21V1414IM48
• Description: 4-CH FULL-SPEED USB UART
• Manufacturer: EXAR [Exar Corporation]

REV. 1.0.0
The internal register set of the V1414 consists of 2 different types of registers: UART Manager and UART
registers. The UART Manager controls the TX, RX and FIFOs of all UART channels. The UART registers
configure and control the remaining UART channel functionality not related to the UART FIFO.
FIFO_ENABLE Registers
Enables the RX FIFO and TX FIFOs. For proper functionality, the UART TX and RX must be enabled in the
following order:
RX_FIFO_RESET and TX_FIFO_RESET Registers
Writing a non-zero value to these registers resets the FIFOs.
A
3.0 REGISTER SET DESCRIPTION
3.1
DDRESS
0X10
0X12
0X18
0X19
0x1C
0x1D
0X11
0x1A
0x1B
0x1E
0x1F
0x13
UART Manager Registers.
FIFO_ENABLE_CHx = 0x1
UART_ENABLE = 0x3
FIFO_ENABLE_CHx = 0x3
FIFO_ENABLE_CHA
FIFO_ENABLE_CHB
FIFO_ENABLE_CHC
FIFO_ENABLE_CHD
RX_FIFO_RESET_CHA
RX_FIFO_RESET_CHB
RX_FIFO_RESET_CHC
RX_FIFO_RESET_CHD
TX_FIFO_RESET_CHA
TX_FIFO_RESET_CHB
TX_FIFO_RESET_CHC
TX_FIFO_RESET_CHD
R
EGISTER
N
AME
.
B
Bit-7
Bit-7
Bit-7
Bit-7
Bit-7
Bit-7
Bit-7
Bit-7
T
IT
ABLE
0
0
0
0
-7
// Enable TX FIFO
// Enable TX and RX of that channel
// Enable RX FIFO
5: UART M
B
Bit-6
Bit-6
Bit-6
Bit-6
Bit-6
Bit-6
Bit-6
Bit-6
IT
0
0
0
0
-6
15
ANAGER
B
Bit-5
Bit-5
Bit-5
Bit-5
Bit-5
Bit-5
Bit-5
Bit-5
IT
0
0
0
0
-5
R
EGISTERS
B
Bit-4
Bit-4
Bit-4
Bit-4
Bit-4
Bit-4
Bit-4
Bit-4
IT
0
0
0
0
-4
B
Bit-3
Bit-3
Bit-3
Bit-3
Bit-3
Bit-3
Bit-3
Bit-3
IT
0
0
0
0
4-CH FULL-SPEED USB UART
-3
B
Bit-2
Bit-2
Bit-2
Bit-2
Bit-2
Bit-2
Bit-2
Bit-2
IT
0
0
0
0
-2
XR21V1414
B
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
RX
RX
RX
RX
IT
-1
B
Bit-0
Bit-0
Bit-0
Bit-0
Bit-0
Bit-0
Bit-0
Bit-0
TX
TX
TX
TX
IT
-0