IBM System/34 Maintenance Manual page 175

Control Storage Cards
Control Storage High and Low
• Each card contains 16K half words (bytes) of storage.
• Two cards are used to get the 2 bytes that make up
the control processor word to be addressed.
• These cards have the same part nUnlber as those
used in main storage.
Control Storage Control
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Storage address register (SAR)
• Not valid control storage address checking
• Control storage initial program load (CSIPL) sequence
control
• System reset generation
• Control storage addressing and timing
• Display bits 8 through 11
• 100-nanosecond oscillator
• Main storage processor running indicator driver
Control Processor Cards
Control Processor Control
• Micro operation register (MOR)
• Control processor clock
• Local storage register (LSR) selection
• Local storage register (LSR) write pulses
• Clocks for X-register, V-register, and storage address
register (SAR)
• Storage gate selection
• Arithmetic logic unit (ALU) gate selection
Arithmetic logic unit (ALU) function bits, carry in, and
l6-bit arithmetic logic unit (ALU) operation
• V-gate selection
• Storage selection and controls (main storage and
control storage)
Instruction decoding
• Mode selector switch decoding
• Cycle control for console and instruction
• Timing control for arithmetic logic unit (ALU) gate and
storage gate check
• Cycle steal interrupt controls
• Micro operation register (MOR) parity check
Control Processor Data Flow
• Storage data register (SDR)
• Local storage register (LSR) (64 registers-8 bits wide
plus 1 parity bit)
• Storage gates
• X-register and V-register and reset for V-register
• Arithmetic logic unit (ALU), parity predict and control
bits
• Arithmetic logic unit (ALU) gates
• Checks for arithmetic logic unit (ALU), storage data
register (SDR), and storage gates
4
15-110
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