Visible to Intel only — GUID: sam1403476558841
Ixiasoft
Visible to Intel only — GUID: sam1403476558841
Ixiasoft
3.5.1. Input Register Bank
The input register bank consists of data, dynamic control signals, and two sets of delay registers.
All the registers in the DSP blocks are positive-edge triggered and cleared on power up. Each multiplier operand can feed an input register or a multiplier directly, bypassing the input registers.
The following variable precision DSP block signals control the input registers within the variable precision DSP block:
- CLK[2..0]
- ENA[2..0]
- ACLR[0]
In 18 x 18 and 18 x 19 mode, you can use the delay registers to balance the latency requirements when you use both the input cascade and chainout features.
The tap-delay line feature allows you to drive the top leg of the multiplier inputs from general routing or from the cascade chain. The following inputs can be driven from either the general routing or from the cascade chain:
- For Arria® V GX, GT, SX, and ST devices:
- dataa_y0 and datab_y1 in 18 x 19 mode
- dataa_y0 in 27 x 27 mode
- For Arria® V GZ devices:
- dataa_y0[17..0] and datab_y1[17..0] in 18 x 18 mode
- dataa_y0 in 27 x 27 mode
The Arria® V GZ variable precision DSP block support 18-bit and 27-bit input cascading.
These figures show the input registers for Arria® V devices.