XR17V358 Datasheet, PDF (33/68 Pages) Exar Corporation – HIGH PERFORMANCE OCTAL PCI EXPRESS UART

REV. P1.0.2
PRELIMINARY
XR17V358
HIGH PERFORMANCE OCTAL PCI EXPRESS UART
Channel 0 to 7 Transmit Data in 32-bit alignment through the Configuration Register Address
0x0100, 0x0500, 0x0900, 0x0D00, 0x1100, 0x1500, 0x1900 and 0x1D00
Transmit Data Byte n+3
Transmit Data Byte n+2
Transmit Data Byte n+1
Transmit Data Byte n+0
B7 B6 B5 B4 B3 B2 B1 B0 B7 B6 B5 B4 B3 B2 B1 B0 B7 B6 B5 B4 B3 B2 B1 B0 B7 B6 B5 B4 B3 B2 B1 B0
PCI Bus
Data Bit-31
PCI Bus
Data Bit-0
2.2 FIFO DATA LOADING AND UNLOADING THROUGH THE UART CHANNEL REGISTERS, THR
AND RHR IN 8-BIT FORMAT
The THR and RHR register address for channel 0 to channel 7 is shown in Table 10 below. The THR and RHR
for each channel 0 to 7 are located sequentially at address 0x0000, 0x0200, 0x0400, 0x0600, 0x0800,
0x0A000, 0x0C00 and 0x0E00. Transmit data byte is loaded to the THR when writing to that address and
receive data is unloaded from the RHR register when reading that address. Both THR and RHR registers are
16C550 compatible in 8-bit format, so each bus operation can only write or read in bytes.
TABLE 10: TRANSMIT AND RECEIVE DATA REGISTER IN BYTE FORMAT, 16C550 COMPATIBLE
TH R and R H R Address Locations For C H0 to C H7 (16C 550 C om patible)
CH0 0x0000 W rite THR Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
CH0 0x0000 Read RHR Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
CH1 0x0400 W rite THR Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
CH1 0x0400 Read RHR Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
CH2 0x0800 W rite THR Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
CH2 0x0800 Read RHR Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
CH3 0x0C00 W rite THR Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
CH3 0x0C00 Read RHR Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
CH4 0x1000 W rite THR Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
CH4 0x1000 Read RHR Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
CH5 0x1400 W rite THR Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
CH5 0x1400 Read RHR Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
CH6 0x1800 W rite THR Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
CH6 0x1800 Read RHR Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
CH7 0x1C00 W rite THR Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
CH7 0x1C00 Read RHR Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
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