Achronix Speedster22i Memory PHY Manual de usuario descargar pdf (Pagina 17)

UG043, April 26, 2014

DLL Specs and Operation

The DLL IP block in the Speedster22i HD1000 is wide range DLL with 1 Master DLL (MDLL)

and 12 Slave DLLs (SDLLs). Table 5 provides the DLL IP Specs and Figure 10 provides a

high-level block diagram of the DLL architecture.

Table 5: DLL IP Specs

Performance Parameters

Data

Frequency Range

311MHz– 1066 MHz

Max P2P period jitter @ 2133MHz with noise

freq = 200Mhz and +/-15mV sinusoidal noise

<2% of cycle time

Minimum high low slave pulse width

25% reference cycle

DLL Lock time

< 500 reference clock cycles

SDLL Step size

360/64 degrees nominal

Output phase accuracy

+/- 4% reference clock cycle

Output phase resolution

6 bits

Slave delay adjustment

0% to 100% of reference cycle

Number of outputs per lane

Number of lanes per master

Reference Input Duty Cycle

40% - 60%

Master DLL

Slave DLL

Lock Detector

Startup Timer

View

Block

Pbias Nbias

input reference

CLK

data_in<11:0>

sdll_out<11:0>

pin out

Figure 10: DLL Architecture High-Level Block Diagram

1 2 ... 12 13 14 15 16 17 18 19 20

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Achronix Speedster22i Memory PHY Manual de usuario Pagina 17