ml7214a-001 Oki Semiconductor, ml7214a-001 Datasheet - Page 24

• Manufacturer Part Number: ml7214a-001
• Description: Voip Codec
• Manufacturer: Oki Semiconductor

FR0B (DMARQ0B)
• FR0B (FRAME/DMA selection register FD_SEL = “0” in frame mode)
• DMARQ0B (FRAME/DMA selection register FD_SEL = “1” in DMA mode)
FR1B (DMARQ1B)
• FR1B (FRAME/DMA selection register FD_SEL = “0” in frame mode)
• DMARQ1B (FRAME/DMA selection register FD_SEL = “1” in DMA mode)
ACK0B/GPIOA[4]
Primary function: ACK0B
Secondary function: GPIOA[4]
ACK1B/GPIOA[5]
Primary function: ACK0B
Secondary function: GPIOA[5]
GPIOA[0], GPIOA[1], GPIOA[2], and GPIOA[3]
These are general-purpose I/O ports A[3:0].
However, the following secondary functions are assigned to GPIOA[2].
Secondary function of GPIOA[2]: Output pin (DPO) of the dual pulse transmitter (DPGEN)
Also, GPIOA[0] and GPIOA[1] are used as the input pins of the dial pulse detector as shown below.
GPIOA[0]: Input pin (DP0) of a dial pulse detector (DPDET0)
GPIOA[1]: Output pin (DP1) of a dial pulse detector (DPDET1)
OKI Semiconductor
When the transmit buffer becomes full, the pin outputs “L” and retains “L” until the specified number of words
are read from the MCU.
This is a DMA request output pin that outputs data when the transmit buffer for DMA access becomes full.
When the transmit buffer becomes full, the pin outputs “L” and the value is reset to “H” automatically when an
acknowledgment signal (ACK0B = “0”) and the fall of a read enable signal (RDB = “1” → “0”) are received
from the MCU side. This operation is repeated until the specified number of words are read from the MCU.
This receive frame output pin outputs data when the receive buffer for frame access becomes empty. When
the receive buffer becomes empty, the pin outputs “L” and retains “L” until the specified number of words are
written from the MCU.
This a DMA request output pin that outputs data when the receive buffer for DMA access becomes empty.
When the receive buffer becomes empty, the pin outputs “L” and the value is reset to “H” automatically when
an acknowledgment signal (ACK1B = “0”) and the fall of a write enable signal (WRB = “1” → “0”) are
received from the MCU side. This opeation is repeated until the specified number of words are written from
the MCU side.
This is a transmit frame output pin that outputs data when the transmit buffer for frame access becomes full.
This is a DMA acknowledgment input pin for DMARQ0B for transmit buffer DMA access; it is enabled in
DMA mode (FD_SEL = “1”).
When using the pin in frame mode (FD_SEL = “0”), fix this pin to “1”.
When the primary function/secondary function selection register (GPFA[4]) of GPIOA[4] is set to “1”, the
pin functions as a general-purpose I/O port GPIOA[4].
This is a DMA acknowledgment input pin for DMARQ1B for receive buffer DMA access; it is enabled in
DMA mode (FD_SEL = “1”).
When using this pin in frame mode (FD_SEL = “0”), fix this pin to “1”.
When the primary function/secondary function selection register (GPFA[5]) of GPIOA[5] is set to “1”, the
pin functions as a general-purpose I/O port GPIOA[5].
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