DS31412N Maxim Integrated Products, DS31412N Datasheet - Page 14

• Manufacturer Part Number: DS31412N
• Description: IC 12CH DS3/3 FRAMER 349-BGA
• Manufacturer: Maxim Integrated Products

Specifications of DS31412N

• Controller Type: DS3/E3 Framer
• Interface: LIU
• Voltage - Supply: 3.135 V ~ 3.465 V
• Current - Supply: 960mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 349-BGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

5.5 CPU Bus Interface Pins
5.6 JTAG Interface Pins
5.7 Supply, Test, and Reset Pins
WR (R/W)
RD (DS)
A[11:0]
NAME
JTCLK
NAME
NAME
JTRST
D[7:0]
SCLK
JTDO
JTMS
TEST
MOT
JTDI
RST
ALE
HIZ
V
V
INT
CS
DD
SS
TYPE
TYPE
TYPE
I/O
—
—
O
O
I
I
I
I
I
I
I
I
I
I
I
I
I
I
Factory Test Enable (Active-Low, Internal 10kW Pullup). This pin should be left open-circuited.
High-Z Control (Active-Low, Internal 10kW Pullup). When this pin is low and JTRST is low, all outputs go to
the high-impedance mode. This pin can be left open-circuited by the user.
Digital Ground Reference. All V
Digital Positive Supply. 3.3V (±5%). All V
CPU Bus Data. The host processor accesses the devices’ internal registers through this bus. These pins
are outputs during reads and inputs otherwise. D7 is the MSB; D0 is the LSB.
CPU Bus Address. The host processor specifies the address of the internal register to be accessed by
this bus. Pins A[11:8] specify the framer to be accessed. In multiplexed bus applications, the A[7:0] pins
should be connected to the D[7:0] pins, and A[11:0] must have a valid register address when the ALE pin
goes low. A11 is the MSB; A0 is the LSB.
CPU Bus Address Latch Enable. This pin controls the address latch for the A[11:0] inputs. When ALE is
high, the latch is transparent. On the falling edge of ALE, the latch samples and holds the A[11:0] inputs.
In nonmultiplexed bus applications, ALE should be wired high. In multiplexed bus applications, A[7:0]
should be connected to D[7:0], and the falling edge of ALE latches the address.
CPU Bus Chip Select, Active Low. The host processor selects the device for read or write access by
driving this pin low.
CPU Bus Read Enable (CPU Bus Data Strobe), Active Low. In Intel mode (MOT = 0), RD controls read
accesses to the device. In Motorola mode (MOT = 1), DS controls both read and write accesses to the
device, while the R/W pin specifies the type of access.
CPU Bus Interrupt, Open Drain, Active Low. This pin is driven low by the device if one or more unmasked
interrupt sources within the device are active. INT remains low until the interrupt is serviced or masked.
System Clock. An ungapped clock with frequency between 33MHz and 52MHz must be provided to this
pin to run certain logic in the CPU bus port. The use of this clock allows the transmit and receive clocks
(TICLK and RCLK) to be gapped, if desired, without affecting the CPU bus timing. This pin can be
connected to TICLK or RCLK if the signal on one of those pins is an ungapped clock.
JTAG IEEE 1149.1 Test Serial-Data Input (Internal 10kW Pullup). Test instructions and data are clocked in
on this pin on the rising edge of JTCLK. If not used, JTDI should be left unconnected or driven high.
JTAG IEEE 1149.1 Test Serial-Data Output. Test instructions are clocked out of this pin on the falling
edge of JTCLK. If not used, JTDO should be left open-circuited. This pin is in tri-state mode after JTRST is
activated.
JTAG IEEE 1149.1 Test Reset (Active-Low, Internal 10kW Pullup). This pin is used to asynchronously
reset the test access port controller. At power-up, JTRST must be driven low and then high. This action
sets the device into the boundary scan bypass mode, allowing normal device operation. If boundary scan
is not used, this pin should be held low.
JTAG IEEE 1149.1 Test Mode Select (Internal 10kW Pullup). This pin is sampled on the rising edge of
JTCLK and is used to place the test port into the various defined IEEE 1149.1 states. If not used, JTMS
should be left unconnected or driven high.
Global Hardware Reset (Active Low). When this pin is driven low, all of the framers in the device are reset
and all of the internal registers are forced to their default values. The device is held in the reset state as
long as this pin is low. The clocks (TICLK and RCLK) must be stable and in spec before this pin is driven
high. The device registers can be configured for operation after the reset is deactivated.
Motorola Bus Mode Select. This pin controls whether the CPU bus operates in Intel mode or in Motorola
mode.
0 = CPU bus is in Intel mode
1 = CPU bus is in Motorola mode
JTAG IEEE 1149.1 Test Serial Clock. This pin is used to shift data into JTDI on the rising edge and out of
JTDO on the falling edge. If not used, this pin should be wired high.
CPU Bus Write Enable (CPU Bus Read/Write Select), Active Low. In Intel mode (MOT = 0), WR controls
write accesses to the device. In Motorola mode (MOT = 1), R/W specifies whether a read or a write
access is to occur.
SS
pins should be wired together.
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DD
pins should be wired together.
FUNCTION
FUNCTION
FUNCTION