NS7520B-1-C36 Digi International, NS7520B-1-C36 Datasheet - Page 179

• Manufacturer Part Number: NS7520B-1-C36
• Description: IC ARM MICROPROCESSOR 177BGA
• Manufacturer: Digi International
• Series: NET+ARM®r

Specifications of NS7520B-1-C36

• Applications: Network Processor
• Core Processor: ARM7
• Program Memory Type: External Program Memory
• Controller Series: -
• Ram Size: External
• Interface: EBI/EMI, Ethernet, DMA, SPI, UART
• Number Of I /o: 16
• Voltage - Supply: 1.4 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 177-LFBGA
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Ethernet FIFO Data register
Table 56: ENDEC status signal cross-reference
Address: FF80 0008 / FF80 000C (secondary address)
The Ethernet FIFO Data register allows manual interface with the Ethernet FIFO,
rather than using DMA support. This register is used primarily as a diagnostic tool.
Writing to the Ethernet FIFO Data register
Writing to the Ethernet FIFO Data register loads the transmit FIFO. This register can
be written only when the TXREGE bit is set in the Ethernet General Status register,
indicating that space is available in the transmit FIFO.
The transmit FIFO has a secondary address
transmit frame. The first and middle words must use the primary address
(FF80 0008)
Writing to the secondary address with the transmit interrupts disabled (ETXBC in the
Ethernet General Control register) initiates transmission of data from the transmit
FIFO. Otherwise, transmission begins when the TX FIFO byte count equals the
selected watermark (ETXWM in the Ethernet General Control register).
Reading from the Ethernet FIFO Data register
Reading from the Ethernet FIFO Data register empties the receive FIFO. The Ethernet
General Status register indicates how many bytes are available to be read. The
receive FIFO is available only when the RXBR bit has been set to 1, which clears the
bit, in the Ethernet General Status register.
D15
D13
D12
D11
D10
Data bit
.
RXD2
RXD1
RXD3
RXER
RXDV
NS7520 pin
(FF80 000C)
w w w . d i g i e m b e d d e d . c o m
that signifies the last word of a
E t h e r n e t M o d u l e
1 6 7