Visible to Intel only — GUID: iga1404776036508
Ixiasoft
Visible to Intel only — GUID: iga1404776036508
Ixiasoft
10.2.10.4. Underrun
No mechanisms exist to detect or prevent under-run.
On transmit path, an interrupts (when enabled) can be generated when the transmit holding register is empty or when the transmit FIFO is below a programmed level.
On receive path, the software driver is expected to read from the UART receive buffer (FIFO-less) or the Rx FIFO based on interrupts (when enabled) or status registers indicating presence of receive data (Data Ready bit, LSR[0]). If reads to Receive Buffer Register is triggered with data ready register being zero, undefined read data is returned.