Scheduler

Scheduler Design Specifications

FPGA Frequency Estimate (synplify_pro): 147 MHz FPGA Area Estimate (synplify_pro): 14,357 LUTs

ASIC Frequency Estimate (dc_shell): 1.3 GHz

The Scheduler of SCOORE is responsible for keeping track of RAW (or true) dependencies between instructions. It is 3 stages and corresponds to stage WK1...n of the SCOORE pipeline on the Main Page. The structures that make up the long-latency Scheduler are:

     1. 64-entry instruction window
     2. 512 bit vector for register status
     3. 64-entry dependence table
     4. 64 bit vector for select

Details of these structures and how they are organized in the pipeline are given below.

Scheduler Interface

CLK and RESET are global inputs to the Scheduler

Inputs from RAT/ROB:

 -clear
 -4 instructions

Inputs from Compute Engine:

• • NOTE: Compute Engine prodvides all needed information in Cunit_DoneType and MunitDoneType

  -cunit_done
  -cunit_pdest
  -cunit_fault

  -munit_done
  -munit_pdest
  -munit_fault

Inputs from Scoreboard

  -busy

---

Outputs to RAT/ROB

  -busy - scheduler instruction window is full

Outputs to Scoreboard

  -up to 6 instructions/cycle

Unit Descriptions

--Ashu Sharma 18:29, 2 May 2009 (PDT)