Lattice Semiconductor ispMACH 4256V, User Manual

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ispMACH 4256V Breakout Board Evaluation Kit
Figure 3. ispMACH 4256V Breakout Board Block Diagram
ispMACH4256 V -5T
N 144C
2 x 20 Header
Landing (J3)
LED
Array
20 GPIO
USB
Controller
USB Mini B
Socket
A/Mini-B
USB Ca b le
JTAG
Programming
8
2 x 20 Header
Landing (J4)
35 GPIO
40 GPIO
15 GPIO
1 x 8 JTAG Header
Landing (J1)
8
5 MHz
Oscillator
2 x 20 Header
Landing (J5)
2 x 20 Header
Landing (J6)
Table 1 describes the components on the board and the interfaces it supports.
Table 1. Breakout Board Components and Interfaces
Component/Interface Type Schematic Reference Description
Circuits
USB Controller Circuit U2: FT2232H USB-to-JTAG interface and dual USB UART/FIFO IC
USB Mini-B
Socket I/O J1:USB_MINI_B Programming and debug interface
Components
LC4256V CPLD U4: LC4256V-5TN144C
256-macrocell CPLD packaged in a 20 mm x 20
mm, 144-pin TQFP
SiTIME5.00000M Oscillator
X5: SIT8918AE-13-33E-
5.000000G
SiTIME 5 MHz external SMD oscillator
Interfaces
LED Array Output D8-D1 Red LEDs
Four 2x20 header landings I/O
J3: header_2x20
J4: header_2x20
J5: header_2x20
J6: header_2x20
User-definable I/O
1 x 8 header landing I/O J1: header_1x8 Optional JTAG interface
4 x 15 prototype area J9 Prototype area 100mil centered holes
Subsystems
This section describes the principle subsystems for the ispMACH 4256V Breakout Board in alphabetical order.
Clock Sources
All clocks for the counter demonstration design originates from an external 5 MHz oscillator connected to Pin 128
of ispMACH 4256V chip. You may use an expansion header landing to drive a CPLD input with an alternate clock
source. To drive Pin 128 from header J4, disconnect X5 from the circuit by removing R23.
Expansion Header Landings
The expansion header landings provide access to user GPIOs, primary inputs, clocks, and Bank 0/1 VCCO pins of
the ispMACH 4256V. The remaining pins serve as power supplies for external connections. Each landing is config-
ured as one 2 x 20 100 mil.
Table 2. Expansion Connector Reference
Item Description
Reference Designators J3, J4, J5, J6
Part Number header_2x20