uart_phy_rx= AsyncSerialRX(uart_divisor,divisor_bits=16,pins=uart_pins)

uart_phy_tx= AsyncSerialTX(uart_divisor,divisor_bits=16,pins=uart_pins)

m.submodules.uart_phy_rx= uart_phy_rx

m.submodules.uart_phy_tx= uart_phy_tx

m.submodules.uart_phy_rx=ResetInserter(uart.rx.rst)(uart_phy_rx)

m.submodules.uart_phy_tx=ResetInserter(uart.tx.rst)(uart_phy_tx)

m.d.comb+= [

uart_phy_rx.divisor.eq(uart.rx.divisor),

{

"rst": Out(1),

"divisor": Out(unsigned(16)),

"symbol": In(wiring.Signature({

"payload": Out(unsigned(symbol_width)),

}

The`rst` port is driven to 1 if`Control.enable` is 0, and 0 if`Control.enable` is 1.

The`uart.TransmitterSignature` class is a`wiring.Signature` describing the interface between the UART peripheral and its transmitter PHY, with:

{

"rst": Out(1),

"divisor": Out(unsigned(16)),

"symbol": Out(wiring.Signature({

"payload": Out(unsigned(symbol_width)),

"valid": Out(unsigned(1)),

"ready": In(unsigned(1)),

"valid": Out(1),

"ready": In(1),

})),

}

The`rst` port is driven to 1 if`Control.enable` is 0, and 0 if`Control.enable` is 1.

The`uart.ReceiverPeripheral` class is a`wiring.Component` implementing the receiver of an UART peripheral, with:

- Decoupling the peripheral from the PHY allows flexibility in implementations. For example, it is easy to add FIFOs between the PHYs and the peripheral.

- A standalone`ReceiverPeripheral` or`TransmitterPeripheral` can be instantiated.

- The choice of a 16-bit divisor with an (otherwise) unspecified encodinggivesallows implementation freedom:

- The choice of a 16-bit divisor with an (otherwise) unspecified encoding allows implementation freedom:

* some may not care about a clock divisor at all (e.g. a behavioral model of an UART PHY, interfacing with a pseudo-TTY).

* some may provide their own divisor encoding scheme (e.g. a 13-bit base value with a 3-bit scale, that can cover common frequency/baudrate combinations with a[<1% error rate](https://github.com/amaranth-lang/rfcs/files/14672989/baud.py.txt) (credit:[@whitequark](https://github.com/whitequark))).