EMERSON VE4001S2T2B5離散輸入卡
Quad UART提供四個(gè)異步串行端口，這些端口被路由到P2連接器。來(lái)自每個(gè)端口的RX、TX、CTS和RTS的TTL電平信號通過(guò)板載RS-232驅動(dòng)器和接收器路由到P2連接器，在P2連接器中，信號可以由轉換模塊拾取。QUART的參考時(shí)鐘頻率為1.8432MHz。所有UART端口都能夠以高達115 Kbaud的速率發(fā)送信號。有關(guān)更多詳細信息和/或編程信息，請參閱ST16C554D數據表。4.8.4控制和定時(shí)器PLD MVME7100控制和定時(shí)器的PLD位于本地總線(xiàn)上?？刂坪投〞r(shí)器PLD在板上提供以下功能：? 本地總線(xiàn)地址鎖存器? 閃存庫、MRAM和Quad UART的芯片選擇? 系統控制和狀態(tài)寄存器? 四個(gè)32位計時(shí)計時(shí)器? 看門(mén)狗計時(shí)器? RTC 1MHz參考時(shí)鐘
The Quad UART provides four asynchronous serial ports which are routed to the P2 connector. The TTL-level signals of RX, TX, CTS, and RTS from each port are routed through on-board RS-232 drivers and receivers to the P2 connector where the signals can be picked up by a transition module. The reference clock frequency for the QUART is 1.8432MHz. All UART ports are capable of signaling at up to 115 Kbaud. Refer to the ST16C554D data sheet for additional details and/or programming information. 4.8.4 Control and Timers PLD The MVME7100 Control and Timers PLD resides on the local bus. The Control and Timers PLD provides the following functions on the board: ? Local bus address latch ? Chip selects for flash banks, MRAM, and Quad UART ? System control and status registers ? Four 32-bit tick timers ? Watch Dog Timer ? RTC 1MHz reference clock
