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A6850

Altera Corporation
Part Number A6850
Manufacturer Altera Corporation
Description Asynchronous Communications Interface Adapter
Published Mar 13, 2007
Detailed Description www.DataSheet4U.com a6850 ® Asynchronous Communications Interface Adapter Data Sheet September 1996, ver. 1 Features...
Datasheet PDF File A6850 PDF File

A6850
A6850

Overview
www.
DataSheet4U.
com a6850 ® Asynchronous Communications Interface Adapter Data Sheet September 1996, ver.
1 Features s s s s s s s a6850 MegaCore function implementing an asychronous communications interface adapter (ACIA) Optimized for FLEX® and MAX® architectures Programmable word lengths, stop bits, and parity Offers divide-by-1, -16, or -64 mode Includes error detection Uses approximately 237 FLEX logic elements (LEs) Functionally based on the Motorola MC6850 device, except as noted in the “Variations & Clarifications” section on page 94 General Description The a6850 MegaCore function implements an ACIA, which is a universal asynchronous receiver/transmitter (UART).
The a6850 provides an interface between a microprocessor and a serial communications channel.
The a6850 receives and transmits data in a variety of configurations, including 7- or 8-bit data words, with odd, even, or no parity, and 1 or 2 stop bits.
See Figure 1.
Figure 1.
a6850 Symbol A6850 nCTS nDCD E nRESET RS RnW RXCLK RXDATA TXCLK CS[2.
.
0] DI[7.
.
0] nIRQ nRTS TXDATA DO[7.
.
0] Altera Corporation A-DS-A6850-01 81 a6850 Asynchronous Communications Interface Adapter Data Sheet Table 1 describes the input and output ports of the a6850.
Table 1.
a6850 Ports Name ncts ndcd Type Input Input Polarity Low Low Description Clear to send, a modem signal name.
The ncts input inhibits the assertion of the transmit data register empty (tdre) status bit.
Data carrier detect, a modem signal name.
When the ndcd signal transitions from low to high, an interrupt to the microprocessor is generated.
Enable for the microprocessor interface.
When e is high, the microprocessor can access the registers.
Asynchronous reset for the registers and control logic.
The nreset pin was not included in the original MC6850 device.
Register select.
This input selects the register based on rnw.
If rnw is high (signaling a read operation), then rs = 1 selects the receiver data register and rs = 0 selects the status regis...


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