NS7520B-1-I46 Digi International, NS7520B-1-I46 Datasheet - Page 168

• Manufacturer Part Number: NS7520B-1-I46
• Description: IC ARM MICROPROCESSOR 177BGA
• Manufacturer: Digi International
• Series: NET+ARM®r

Specifications of NS7520B-1-I46

• 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

1 5 6
D M A c h a n n e l a s s i g n m e n t s
DMA channel assignments
EFE configuration
One DMA channel is dedicated to Ethernet receive and one DMA channel is dedicated
to Ethernet transmit. The Ethernet receiver has four DMA subchannels, which support
the receive buffer descriptor selection feature (see "DMA buffer descriptor,"
beginning on page 130).
Table 52 shows the Ethernet front-end register map. All registers are 32 bits unless
otherwise noted.
Note:
Table 52: EFE register map
FF80 0000
FF80 0004
FF80 0008
FF80 000C
FF80 0010
FF80 0014
FF80 0400
FF80 0404
FF80 0408
FF80 040C
FF80 0410
Address
The Ethernet receiver is assigned DMA channel 1 (1A, 1B, 1C, and 1D).
The Ethernet transmitter is assigned DMA channel 2.
N S 7 5 2 0 H a r d w a r e R e f e r e n c e , R e v G 9 / 2 0 0 7
Reading or writing the MAC configuration registers (address locations
0xFF80 0400 through 0xFF80 05DC) is unreliable without valid clocks on
the TXCLK and RXCLK input pins.
EGCR
EGSR
FIFO
FIFOL
ETSR
ERSR
MAC1
MAC2
IPGT
IPGR
CLRT
Register
Ethernet General Control register
Ethernet General Status register
Ethernet FIFO Data register
Ethernet FIFO Data Register Last
Ethernet Transmit Status register
Ethernet Receive Status register
MAC Configuration Register 1
MAC Configuration Register 2
Back-to-Back Inter-Packet-Gap register
Non-Back-to-Back Inter-Packet-Gap register
Collision Window/Retry register
Register description