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參數(shù)資料
| 型號： | XR21V1414IM-0B-EB |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 5/34頁 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR XR21V1414 |
| 產(chǎn)品培訓模塊： | UART Product Overview XR21V141x Full-Speed USB UART Family |
| 標準包裝： | 1 |
| 主要目的： | 接口，USB 2.0 至 UART |
| 嵌入式： | 否 |
| 已用 IC / 零件： | XR21V1414IM |
| 已供物品： | 板 |
| 其它名稱： | 1016-1427 |
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XR21V1414
13
REV. 1.3.0
4-CH FULL-SPEED USB UART
RX_FIFO_LOW_LATENCY register bit to force the V1414 to be in the low latency mode, or the user may
manually set this bit. With the CDC-ACM driver, the low latency mode is automatically set whenever the baud
rate is set to a value of less than 46921 bps using the CDC_ACM_IF_SET_LINE_CODING command.
1.5.4
GPIO
Each UART has 6 GPIOs. By hardware default the GPIOs are configured as inputs but may be modified by a
custom driver. Additionally, there are several modes that can be enabled to add additional feature such as
auto RTS/CTS flow control, auto DTR/DSR flow control or auto RS-485 half duplex control. See Table 14.
1.5.5
Automatic RTS/CTS Hardware Flow Control
GPIO5 and GPIO4 of the UART channel can be enabled as the RTS# and CTS# signals for Auto RTS/CTS
flow control when GPIO_MODE[2:0] = ’001’ and FLOW_CONTROL[2:0] = ’001’. Automatic RTS flow control is
used to prevent data overrun errors in local RX FIFO by de-asserting the RTS signal to the remote UART.
When there is room in the RX FIFO, the RTS pin will be re-asserted. Automatic CTS flow control is used to
prevent data overrun to the remote RX FIFO. The CTS# input is monitored to suspend/restart the local
transmitter (see Figure 5):
1.5.6
Automatic DTR/DSR Hardware Flow Control
Auto DTR/DSR hardware flow control behaves the same as the Auto RTS/CTS hardware flow control
described above except that it uses the DTR# and DSR# signals.
For Auto hardware flow control,
FLOW_CONTROL[2:0] = ’001’.
GPIO3 and GPIO2 become DTR# and DSR#, respectively, when
GPIO_MODE[2:0] = ’010’.
FIGURE 5. AUTO RTS AND CTS FLOW CONTROL OPERATION
T r a n s m i t t e r
A u t o C T S
M o n i t o r
R e c e i v e r F I F O
T r i g g e r R e a c h e d
A u t o R T S
T r ig g e r L e v e l
R e m o t e U A R T
U A R T B
R T S A #
C T S B #
T X B
R X A
O N
O F F
O N
O F F
1
2
3
4
1 ) C O M p o r t o p e n e d , R X F I F O e m p t y , R T S A # o u t p u t is a s s e r t e d
2 ) S i g n a l p r o p a g a t e d t o C T S B # in p u t
3 ) D a t a b y t e s e n t e r T X F I F O , b e g i n t r a n s m i t t i n g o n T X B
4 ) D a t a p r o p a g a t e s t o R e c e iv in g d e v i c e R X A
5 ) R X F I F O r e a c h e s t h r e s h o ld
6 ) R T S A # d e - a s s e r t s
7 ) S i g n a l p r o p a g a t e s t o C T S B # in p u t
8 ) T r a n s m is s io n s t o p s o n T X B
9 ) U S B B u lk - I n e m p t i e s R X F I F O b e lo w t h r e s h o ld , R T S A # i s a s s e r t e d
1 0 ) S ig n a l p r o p a g a t e d t o C T S B # in p u t
1 1 ) D a t a b y t e s r e s u m e t r a n s m i t t in g o n T X B
5
6
7
8
9
1 0
1 1
R T S A #
C T S B #
T X B
R X A
C T S A #
T X A
R T S B #
R X B
R e c e iv e r F I F O
T r ig g e r R e a c h e d
A u t o R T S
T r i g g e r L e v e l
T r a n s m it t e r
A u t o C T S
M o n it o r
L o c a l U A R T
U A R T A
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相關代理商/技術參數(shù) |
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|---|---|
| XR21V1414IM48 | 制造商:EXAR 制造商全稱:EXAR 功能描述:4-CH FULL-SPEED USB UART |
| XR21V1414IM48-F | 功能描述:USB 接口集成電路 4-Ch 12Mbps 48MHz Internal clock; UART RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:WLCSP-20 |
| XR21V1414IM48-F | 制造商:Exar Corporation 功能描述:IC QUAD UART 12MBPS 3.63V 48-TQFP |
| XR21V1414IM48TR-F | 制造商:Exar Corporation 功能描述:USB-to-UART 4-CH 128Byte FIFO 48-Pin TQFP T/R 制造商:Exar Corporation 功能描述:XR21V1414 Series 12 Mbps 3.63 V Quad Channel USB UART SMT - TQFP-48 制造商:Exar Corporation 功能描述:XR21V1414IM48TR-F 制造商:EXAR 功能描述:USB-to-UART 4-CH 128Byte FIFO 48-Pin TQFP T/R |
| XR21V1414M48-F | 制造商:Exar Corporation 功能描述:UART 4-CH FULL SPEED USB I/F 48TQFP 制造商:Exar Corporation 功能描述:UART, 4-CH FULL SPEED, USB I/F, 48TQFP, No. of Channels:4, Data Rate:12Mbps, Sup |
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