NS7520B-1-C36 Digi International, NS7520B-1-C36 Datasheet - Page 111

• 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

Table 38: Chip Select Option Register A bit definition
WAIT[3:0]/BCYC[1:0] continued
D05:04
D03:02
Bits
R/W
R/W
Access
BSIZE
PS
Mnemonic
0
0 for
CS[4:1],
per boot-
strap for
CS0
Reset
w w w . d i g i e m b e d d e d . c o m
Burst access size in beats
00
01
10
11
Controls the maximum number of memory cycles
that can occur in a burst cycle. This field
determines only the maximum number of
allowable bus cycles; the current bus master can
choose to burst a smaller amount. If the current bus
master continues to burst, the peripheral terminates
the burst when the number of memory cycles
reaches the maximum allowed by this field.
Port size
00
01
10
11
Controls the size of the memory peripheral device:
8-, 16-, or 32-bits.
The initial state of PS for CS0 depends on
hardware initialization settings. See "NS7520
bootstrap initialization" on page 59 for more
information.
Description
When DRSEL=1 and DMODE=10
See "SDRAM," beginning on page 111.
follows the timing of a single access. CAS_
is asserted BCYC BCLK cycles for all cycles
that follow the initial cycle in a burst. If
BCYC is set to 0, the controller cannot
execute burst cycles.
The first memory cycle of a burst access
2 system bus cycles in burst access
4 system bus cycles in burst access
8 system bus cycles in burst access
16 system bus cycles in burst access
32-bit port size
16-bit port size
8-bit port size
Reserved
M e m o r y C o n t r o l l e r M o d u l e
9 9