The Hytec IP-SI-8515 is a single-width Industry Pack that provides 8 serial interface lines with the following characteristics:- 

• 8 independent RS-232 UART channels

• 64 byte Transmit and Receive FIFOs

• Transmit and Receive FIFO level counters

• Programmable Tx and Rx FIFO Trigger Levels

• Automatic RTS/CTS Flow Control

• Automatic Xon/Xoff Software Flow Control with Status Indication

• Programmable Data Rate with Prescaler

• Up to 6.25 Mbps Serial Data Rate

• Single Interrupt Output for all 8 UARTs

• Global Interrupt Source for all 8 UARTs

• Simultaneous UART channel initialisation

Specifications 

Size:                             Single width Industry Pack 1.8ins x 3.9 ins
Operating temp:             0 to 45 deg C ambient
Number of channels:        8
Max. baud rate:             921.6kbps with internal clock.
Data format:                  Binary/ASCII
Input/Output levels:        RS-232
Internal clock:                14.7456MHz oscillator
Clock accuracy:             +/-100ppm (0.01%)       
Power:                          +5V @ 400mA typical

Software Drivers are available including EPICS drivers.

Operating Modes                                                                                                             

Application Registers
There are a number of application specific (I/O) registers.
Interrupt Register (IP address 0)
Read/write register defines the vector V7-V0, Read only interrupt source U7-U0

V0-7      Interrupt vector to be used during IACK
U0-7     Any bit which is set indicates the interrupting UART
Interrupt Source Registers 1-3 (IP address 1-3)
Indicate the source of each interrupt from UART0 to 7 . Bits 8-15 are 0.
Read only register.

Timer Control Register (IP address 4&5)
Read/write register.
CS-Clock Select S/R-Single/Retrigger SS-Start/Stop IE-Timer Interrupt Enable

Timer Counter Register (IP address 6&7)
Read/write register.
Timer counter data register.

8x Mode Register (IP address 8)
Read/write register.
Logic 0 sets 16x sampling. Logic 1 sets 8x sampling

Reserved Register (IP address 9)
Read only register.

Reset Register (IP address A).
Resets are write only
R0-7 reset UART0-7

Sleep Register (IP address B)
S0-7 set UART0-7 into sleep mode Read/write register.