W90220F Winbond Electronics Corp America, W90220F Datasheet - Page 23

• Manufacturer Part Number: W90220F
• Description: Pa-risc Embedded Controller
• Manufacturer: Winbond Electronics Corp America

The above information is the exclusive intellectual property of Winbond Electroncs Corp. and shall not be dsiclosed or distributed or reproduced without permission from
Winbond.
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- Short Framing : When CFGH[3] is set to logic 0, SSI is operated in long framing mode. The following features
5.1.7
Overview :
(Left for Blank)
TIMER CHANNELS
- The shifting data bits on SDI and SDO are always MSB first.
- If serial word length is not 16 or 32, it is software responsibility to left(MSB) justify the transmit
- SSI module always shifts out logic 0s on each frame sync if transmit FIFO is empty at that time.
- A receiver FIFO interrupt will be asserted (when RX-FIFO interrupt is enable) if the received
- Fig 6.1.5-2 shows a standard long framing transfer where serial word length is 3 (CFGH[8:11] =
consists of the following features.
- The frame sync (SYNC) is asserted for one SCLK immediately before the first bit of transmit
- The frame sync (SYNC) is asserted for one SCLK period.
- All other features are the same as long framing mode.
- Fig 6.1.5-3 shows a standard short framing transfer where serial word length is 3 (CFGH[8:11] =
are included in short framing mode
data words before writing it to transmit FIFO, the received data before being written into receive
FIFO is righ(LSB) justified automatically by SSI module where the unfilled MSBs are catneted
with logic 0s.
data words exceeds the receive FIFO's threshold level. Likewise, a transmitter FIFO interrupt
will be asserted (when TX-FIFO interrupt is enable) if the available data words in transmit FIFO
is lower than its threshold level.
2), words per frame is 3 (CFGH[12:15]=2) and bits per frame is 9 (CFGL[0:7] = 10).
and receive data.
2), words per frame is 3 (CFGH[12:15]=2) and bits per frame is 9 (CFGL[0:7] = 10).
SCLK
SYNC
SDI
SDO
Fig 5.1.6-2 SSI long framing transfer
SCLK
SYNC
SDI
SDO
Fig 5.1.6-3 SSI short framing transfer
D1_1
D1_1
D1_1
D1_1
D1_2
D1_2
D1_2
D1_2
D1_3
D1_3
D1_3
D1_3
D2_1
D2_1
D2_1
D2_1
D2_2
D2_2
D2_2
D2_2
D2_3
D2_3
D2_3
D2_3
D3_1
D3_1
D3_1
D3_1
D3_2
D3_2
D3_2
D3_2
D3_3
D3_3
D3_3
D3_3
D1_1
D1_1
D1_1
D1_1
D1_2
D1_2
D1_2
D1_2
W90220F
Version 0.84