REV. 1.0.3 INT0 [7:0] Channel Interrupt Indicator Each bit gives an indication of the channe" />
參數(shù)資料
型號(hào): XR17V354IB-E4-EVB
廠商: Exar Corporation
文件頁(yè)數(shù): 10/66頁(yè)
文件大?。?/td> 0K
描述: EVAL BRD FOR XR17V354-E4 176BGA
產(chǎn)品培訓(xùn)模塊: PCIe UARTs
標(biāo)準(zhǔn)包裝: 1
主要目的: 接口,UART
嵌入式:
已用 IC / 零件: XR17V354
已供物品:
其它名稱: 1016-1612
XR17V354IB-E4-EVB-ND
XR17V354
18
HIGH PERFORMANCE QUAD PCI-EXPRESS UART
REV. 1.0.3
INT0 [7:0] Channel Interrupt Indicator
Each bit gives an indication of the channel that has requested for service. Bit [0] represents channel 0 and
bit [3] indicates channel 3. The upper four bits INT0[7:4] are reserved. Logic 1 indicates the channel N [3:0] has
called for service. The interrupt bit clears after reading the appropriate register of the interrupting channel
register, see Interrupt Clearing section.
The INT0 register provides individual status for each channel
INT0 Register
Individual UART Channel Interrupt Status
Ch-3 Ch-2 Ch-1 Ch-0
0
Bit-3 Bit-2 Bit-1 Bit-0
Rsvd
INT3, INT2 and INT1 [31:8] 3-bit Channel Interrupt Encoding
Each channel’s interrupt is encoded into 3 bits for receive, transmit, and status. Bits [10:8] represent channel 0
and go up to channel 3 with bits [19:17]. The 3-bit encoding and their priority order are shown below in Table 7.
The wake-up interrupt, timer/counter interrupt and MPIO interrupt are only reported in channel 0 of INT1
(bits[10:8]). These interrupts are not reported in any other location.
FIGURE 4. THE GLOBAL INTERRUPT REGISTER, INT0, INT1, INT2 AND INT3
Channel-3
Channel-2
Channel-1
Channel-0
INT2 Register
INT1 Register
INT3 Register
INT0 Register
Interrupt Registers,
INT0, INT1, INT2 and INT3
Bit-0
Bit-1
Bit-2
Bit-3
00
0
Ch-3 Ch-2 Ch-1 Ch-0
Bit
N+1
Bit
N+2
Bit
N
Bit
N+1
Bit
N+2
Bit
N
Bit
N+1
Bit
N+2
Bit
N
Bit
N+1
Bit
N+2
Bit
N
0
00
0
00
0
00
0
00
Rsvd Rsvd Rsvd Rsvd
Reserved
TABLE 7: UART CHANNEL [3:0] INTERRUPT SOURCE ENCODING
PRIORITY
BIT[N+2]
BIT[N+1]
BIT[N]
INTERRUPT SOURCE(S)
x
0
None or wake-up indicator (wake-up indicator is reported in channel 0 only)
1
0
1
RXRDY and RX Line Status (logic OR of LSR[4:1])
2
0
1
0
RXRDY Time-out
3
0
1
TXRDY, THR or TSR (auto RS485 mode) empty
4
1
0
MSR, RTS/CTS or DTR/DSR delta or Xoff/Xon det. or special char. detected
5
1
0
1
Reserved.
6
1
0
MPIO pin(s). Reported in channel 0 only.
7
1
Timer/Counter. Reported in channel 0 only.
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