參數(shù)資料
型號: SPAKD56366PV120
廠商: MOTOROLA INC
元件分類: 數(shù)字信號處理
英文描述: 24-BIT, 120 MHz, OTHER DSP, PQFP144
封裝: TQFP-144
文件頁數(shù): 15/147頁
文件大小: 2156K
代理商: SPAKD56366PV120
Design Considerations
Host Port Considerations
MOTOROLA
DSP56366 Advance Information
4-5
and MF
≤ 4, this jitter is less than ±0.6 ns; otherwise, this jitter is not guaranteed. However, for MF < 10
and input frequencies greater than 10 MHz, this jitter is less than
±2 ns.
Frequency Jitter Performance
The frequency jitter of the PLL is defined as the variation of the frequency of the internal DSP clock. For
small MF (MF < 10) this jitter is smaller than 0.5%. For mid-range MF (10 < MF < 500) this jitter is
between 0.5% and approximately 2%. For large MF (MF > 500), the frequency jitter is 2–3%.
Input (EXTAL) Jitter Requirements
The allowed jitter on the frequency of EXTAL is 0.5%. If the rate of change of the frequency of EXTAL is
slow (i.e., it does not jump between the minimum and maximum values in one cycle) or the frequency of
the jitter is fast (i.e., it does not stay at an extreme value for a long time), then the allowed jitter can be 2%.
The phase and frequency jitter performance results are only valid if the input jitter is less than the
prescribed values.
HOST PORT CONSIDERATIONS
Careful synchronization is required when reading multi-bit registers that are written by another
asynchronous system. This synchronization is a common problem when two asynchronous systems are
connected, as they are in the host interface. The following paragraphs present considerations for proper
operation.
Host Programming Considerations
Unsynchronized Reading of Receive Byte Registers—When reading the receive byte registers,
receive register high (RXH), receive register middle (RXM), or receive register low (RXL), the
host interface programmer should use interrupts or poll the receive register data full (RXDF) flag
that indicates whether data is available. This ensures that the data in the receive byte registers will
be valid.
Overwriting Transmit Byte Registers—The host interface programmer should not write to the
transmit byte registers, transmit register high (TXH), transmit register middle (TXM), or transmit
register low (TXL), unless the transmit register data empty (TXDE) bit is set, indicating that the
transmit byte registers are empty. This ensures that the transmit byte registers will transfer valid
data to the host receive (HRX) register.
Synchronization of Status Bits from DSP to Host—HC, HOREQ, DMA, HF3, HF2, TRDY,
TXDE, and RXDF status bits are set or cleared from inside the DSP and read by the host processor
(refer to the user’s manual for descriptions of these status bits). The host can read these status bits
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