NS7520B-1-I46 Digi International, NS7520B-1-I46 Datasheet - Page 160

• 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 4 8
D M A c o n t r o l l e r r e s e t
DMA controller reset
Figure 20: Hardware needed for external memory-to-memory DMA transfers
You can simultaneously reset the DMA controllers for channels 1-13 without affecting
any NS7520 modules. Just set the DMA reset bit in the GEN module System Control
register to 1 and then back to 0 (see "DMARST" on page 66).
All DMA controllers are reset by all forms of hardware and software resets.
ADDR[X:0]
DATA{ 31:0]
Memory
CS_
R/W_
DATA[31:0]
ADDR[27:0]
DREQ_
DACK_
DONE_
R/W_
CSx_
CSx_
If the source buffer pointer points to the external device, the device, in
conjunction with appropriate memory device timing or external bus cycle
timing, provides data when DACK_ is asserted.
If the destination buffer pointer points to the external device, the device,
in conjunction with appropriate memory device timing or external bus cycle
timing, accepts data when DACK_ is asserted.
TEA_ indicates the existence and termination of burst cycles.
NS7520
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
External device
Enable
DONE
Direction
DATA[31:0]
ADDR[27:0]
CS
DREQ_