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4.2.4 EPI board circuit explanation
EPI Board consists of next 14 blocks.
1. P/S Conv.（Parallel Serial Conversion）
The Parallel complex data from DBF Board is converted to Serial complex data in this
block.
2. LPF （Low Pass Filter）
Filter processing of the complex data from PS Conv Block is carried out by this LPF.
3. Decim （Decimation:Data Pick Up）
The number of Filtered data is lessened according to display depth. The number
changes also with the sizes of CFM ROI..
4. WPI （RF Interpolation & Pulse Inversion）
Processing of RF Interpolation or Pulse Inversion is performed.
5. Digital-TGC （Digital Time Gain Control）
Digital Time Gain Control is performed at the time of a B(M)-mode.
6. TCI I/F （TCI Bus Interface）
The data after signal processing is changed into a TCI Bus format, and it transmits to a
MAP Board.
7. US-Scan Controller (US scanning controller)
The kind of ultrasound beam, the transmitting direction, and data taking-in timing of
signal processing blocks is controlled by DMA sequencer.
8. US-SYNC Generator (US synchronized signal generator)
It generates the signal which synchronized with ultrasonic transmission of Y-SYNC*
etc. according to PRF.
9. CLK Generator (Generating Clocks)
From a 125MHz crystal oscillator, it generates 8ns, 16ns, 20ns, 32ns, 40ns, 64ns, and
the 4 time cycle clock of transmitting frequency. Clock to other boards is outputted by
LVDS.
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L1E-EA0229
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